Just adding one thing that I found out. Changing the Operation Mode to Access point, the issue decreased a bit. It seems to fail less often. Let's see if this new firmware can improve anything.

@TP-Link_Deco how do we install the firmware manually? I only see the option of checking for updates.

I have been having the exact same problem. Just wanted to post here so I can get a notification if you get any answers... Also, let me know if you found a fix.