If wifi connection used by your Linux box is not stable and goes up&down, with wpa_supplicant requiring some manual restart you could use a simple script that does it for you.
Below you can find a script i’m using on a RaspberryPi 3 with Raspian installed.
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#!/bin/sh WLAN=wlan0 DEAD=$(service wpa_supplicant status 2>/dev/null | grep -i dead) YESIP=$( ip addr show $WLAN | grep "inet\b" | awk '{print $2}' | cut -d/ -f1 ) CMD=$( ps -eo args | grep wpa_suppl | grep -v grep ) if [ "$YESIP" == "" ]; then DEAD="DEAD" else ping 8.8.8.8 -c 5 >/dev/null 2>/dev/null if [ "$?" != "0" ]; then DEAD="DEAD" else DEAD="" fi fi if [ "$DEAD" != "" ]; then pkill -9 wpa_supplicant $CMD & fi |
Remember to use a value for WLAN corresponding to you wifi interface.
The shell script alone doesn’t give you a fully automatic and periodic check&restart … to have it you should use crontab and schedule script invocation (user: root!) every 15 minutes (or every time you need it).