mjhjmtu

We recently upgrade our internet provider which now comes with 2.4Ghz and 5Ghz wifi. I can connect properly on 2.4Ghz while on 5Ghz I am experiencing random "lags" in the connection. More specifically, the network manager is not disconnecting from the router however to refresh a page in a browser when the lag strikes it needs 7-30 seconds. Some times ssh connection is dropped too. This is happening in a random manner but usually every 3-5 minutes.
I tried to change the 5Ghz channel with no luck. The rest of the devices in the house are not experiencing any issues.

I 've already tried to reinstall Intel 3160 drives from backports as well as to reinstall the linux-image with no luck. I 've also disabled wifi.powersave to wlan0 with no luck.

Does anyone have an idea how to solve or debug this issue?

These are some system information:

uname -a:

Linux debian 4.9.0-8-amd64 #1 SMP Debian 4.9.110-3+deb9u5 (2018-09-30) x86_64 GNU/Linux (Debian stretch)

lshw -C network:

*-network
 description: Wireless interface
 product: Wireless 3160
 vendor: Intel Corporation
 physical id: 0
 bus info: pci@0000:03:00.0
 logical name: wlan0
 version: 93
 serial: 34:e6:ad:be:63:65
 width: 64 bits
 clock: 33MHz
 capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
 configuration: broadcast=yes driver=iwlwifi driverversion=4.9.0-8-amd64 firmware=17.948900127.0 ip=192.168.0.17 latency=0 link=yes multicast=yes wireless=IEEE 802.11
 resources: irq:49 memory:c1000000-c1001fff

iwconfig:

wlan0 IEEE 802.11 ESSID:"BRA****" 
 Mode:Managed Frequency:5.56 GHz Access Point: F8:AB:05:00:1E:DE 
 Bit Rate=390 Mb/s Tx-Power=22 dBm 
 Retry short limit:7 RTS thr:off Fragment thr:off
 Encryption key:off
 Power Management:off
 Link Quality=62/70 Signal level=-48 dBm 
 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
 Tx excessive retries:0 Invalid misc:125 Missed beacon:0

ifconfig:

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 192.168.0.17 netmask 255.255.255.0 broadcast 192.168.0.255
 inet6 fe80::36e6:adff:febe:6365 prefixlen 64 scopeid 0x20<link>
 inet6 2a02:8109:a3c0:55af:36e6:adff:febe:6365 prefixlen 64 scopeid 0x0<global>
 ether 34:e6:ad:be:63:65 txqueuelen 1000 (Ethernet)
 RX packets 415816 bytes 507186123 (483.6 MiB)
 RX errors 0 dropped 2 overruns 0 frame 0
 TX packets 144134 bytes 31353570 (29.9 MiB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisi

lspci -k -nn | grep -A 3 -i net:

03:00.0 Network controller [0280]: Intel Corporation Wireless 3160 [8086:08b4] (rev 93)
 Subsystem: Intel Corporation Dual Band Wireless AC 3160 [8086:8270]
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

modinfo iwlwifi:

filename: /lib/modules/4.9.0-8-amd64/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2015 Intel Corporation <linuxwifi@intel.com>
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-6.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-4.ucode
firmware: iwlwifi-7265D-26.ucode
firmware: iwlwifi-7265-17.ucode
firmware: iwlwifi-3168-26.ucode
firmware: iwlwifi-3160-17.ucode
firmware: iwlwifi-7260-17.ucode
firmware: iwlwifi-8265-26.ucode
firmware: iwlwifi-8000C-26.ucode
firmware: iwlwifi-9000-pu-a0-lc-a0--26.ucode
firmware: iwlwifi-9260-th-a0-jf-a0--26.ucode
firmware: iwlwifi-9000-pu-a0-jf-a0--26.ucode
firmware: iwlwifi-Qu-a0-jf-b0--26.ucode
alias: pci:v00008086d00002720sv*sd00000A10bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001030bc*sc*i*
alias: pci:v00008086d00002526sv*sd00001030bc*sc*i*
alias: pci:v00008086d000031DCsv*sd00000030bc*sc*i*
[...]
depends: cfg80211
retpoline: Y
intree: Y
vermagic: 4.9.0-8-amd64 SMP mod_unload modversions 
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 4K for other devices 1:4K 2:8K 3:12K (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm: nvm_file:NVM file name (charp)
parm: d0i3_disable:disable d0i3 functionality (default: Y) (bool)
parm: lar_disable:disable LAR functionality (default: N) (bool)
parm: uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
parm: d0i3_timeout:Timeout to D0i3 entry when idle (ms) (uint)
parm: disable_11ac:Disable VHT capabilities (default: false) (bool)