I have my Tapo S110E set in dry contact mode with Trigger Mode set to impulse. No cable switch connected - it's "disabled" under "switch type". The S110E is controlling an electric strike lock that is powered through 12V DC. When S110E is closing a circuit, the ground wire loop is closed and the lock opens. I'm not using wet contact, since S110E is rated from 24V DC and my end devices do not support this voltage, so I had to use dry contact. 

I normally control the switch through button S200B and smart action - button pressed, the lock opens. 

Problem: I get random trigger failures in the app at very random times. I double checked wiring, even bought second S110E unit, but the problem is the same. I placed an additional AP to bring WiFi signal strength up (now at -47 RSSI). Sometimes it shows single failure on one button press, sometimes multiple (see screenshots).

What could be the reason of these random failures? This does not make sense to me. It seems to be either problem on the TP-Link server side or some electric problem. Mind that this S110E just replaced my old Sonoff and never had a single issue with Sonoff. The main reason for switch was to have everything in one app since I use Tapo a lot. 

Attaching screenshots for more info.