Since I mostly communicate in English (since some years), my German [native language] degenerated increasingly.
Additionally, my English suffers as well, because I constantly switch between the languages in my mind - The bilingualism requires too much "brain power", and often I come up with mixed German-English word-gibberish. I don't even recognize I switch between the languages if I talk with a person who us unable to comprehend/speak English.
Additionally, when I construct my sentences far too many synonyms pop up in my mind - and too many options how to deliver my thoughts/put my thoughts into sentences occur simultaneously - which results in a kind of entangled soup clot - and I mix all these chains of thought together and it becomes utterly incomprehensible in the end.
What sort of phenomenon is that?
I know that my Working Memory is overloaded with all the junk of detail infos it receives from my Long-Term-Memory; And additionally my memory/ information processing becomes increasingly slow if the Working Memory is "approaching its limit". If my Working Memory is approaching its limit it is especially prone to errors. Then, due to the "error-correction loop" (I think it's a form of metacognition) it requires increasingly more time to process information. This, in (re)turn, feeds back to overchallenging the Working Memory additionally.