Raspberry PI random connection interruptions

Question

i am running a raspberry pi B+ headless and losing network connection irregulary.
I am living with that since a few years, but now want to fix the problem.
What would be a good approach to find out the reason?

Problem

ssh connection to PI not possible sometimes (today failing nearly constantly, otherwise every few days)
Active ssh connection aborted
PI cannot get internet data (pinging google fails)

Setup

Raspberry PI B+
WIFI USB Adapter EDIMAX EW 7811Un
My own app (digital picture frame) is running on python 3 and QT5.7

My countermeasures so far

self implemented software wachdog that checks some connection parameters and reboots if necessary (i would say works in 95% of the cases)
Auto PowerOff deactivated for the Wifi adapter by setting rtw_power_mgnt=0 and rtw_enusbss=0 in /etc/modprobe.d/8192cu.conf

Comments

My WIFI connection at home sometimes gets interrupted as well. But far less often than the connection to the PI fails
I know that similar questions have been asked before, but i was not able to adapt them to my specific problem, sorry.

Thanks for any directions

Ben

Alex · Answer

A few thoughts :-

This post shows a couple of possibilities. https://www.raspberrypi.org/forums/viewtopic.php?t=129021 MrEngman I gather wrote a helpful installer script for the Edmix range of Wifis.  Research a bit more yourself before trying these perhaps.

1) Remove ifplugd

apt-get purge ifplugd

2) Disable any conflicting drivers, read in more detail before doing anything, but e.g.

blacklist rtl8192cu
blacklist rtl8xxxu.conf

Have you tried updating your raspbian/kernel/firmware?  It might help fix the situation. https://www.raspberrypi.org/documentation/raspbian/updating.md

sudo apt update
sudo apt full-upgrade

It may be possible that your power supply may be a bit too weak/unreliable to drive the USB wifi.
I remember my EDIMAX clone wifi being quite cheap and a pain to setup and use.  Buying a different brand may help, though I notice the Pi brand can have this problem too.
Treat yourself to a newer Pi with built-in Wifi ;)

Good luck!

Raspberry PI random connection interruptions

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