Tuya plug become unavailable for no apparent reason

Dear all,
One of my Tuya smart plug suddenly become very unstable. As you can see from History image, it’s become unavailable for sometimes then back to online by itself. This plug is located nearest to wifi hotspot so I dont think it’s wifi connection issue. I have tried to reset connection and pair again to Tuya app but it’s still happening. It’s quite annoying when I want it to on/off and it just unreachable at that very moment. Any suggestions?

Hi, same problem with light devices

apparently random.

Regards