Continuous problems with gmail App-password

Dear eM-Client Team,

I am having continuous trouble with your eM-client and my Gmail-Account.

I am using Google 2-step verification an therefore I have to generate an “App-Password” for eM-Client. 

At first there doesn’t seem to be a problem, the program works normally, but after some time eM-Client says that the password is not accepted. When I check on my gmail account I can see that the app-password is still valid. It does not make any sense.

I have to generate a new one to make it work. On one day I had to generate one two times!

I love your program a lot and it would be a shame to give it up because of that but it is getting annoying.

I hope you can help me.