archiving, redologs , database stopping

I'm having a big problem my database is stopping for like 20 seconds because it can not write to it redo log

As it looks it seems to be full, but this should not be. The acriver is archiving group 3 and the lgwr wants to write to group 1. Is there anyone how has had this problem before.
Or who might have some tips on where or how i can solve this.

I have looked for I/o problme but this does not seen to be the problem

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