ITEAD Sonoff

I have some problems with BlitzWolf SHP 6 flashed with Tasmota 7.1.1
Sometimes they work but sometimes not. I also lose connection with but I can connect to them on there ipadress in ex Chrome.
After restarting Sonoff application they work for a while and then lose connection again.
Also sometime get at error message in Homey app on my Iphone" Something went wrong try again"
I have deleted device and added them again, same problem.
Can I see somekind of logfile so I can get more information what goes wrong ?