Likes disappear

[_KatKat]

Plan

Premium

Country

Germany

Device

Operating System

Windows 10 and Android

My Question or Issue

Since some weeks my likes disappear, meaning that songs that I like will aapear shortly after I liked them in the liked songs playlist. After a while the likes will then dissapear and the songs aren't marked as liked anyore and won't appear in the playlist. I have had this problem when using the Android app, the windows app and also when using spotify web. I get no notofication about havng reached the maximum number of liked songs. I used IFTTT before and disconnected the app from it in an attemp to fix the problem, but this didn't change anything.

I think there might be a connection to having merged two accounts some months ago, even though I think there are likes in my library that date to after the time of the merging.

Any ideas and help would be highly appreciated!