Hiri email client issue not sync

I configured Hiri with our Exhange acocount. After some sync well done, it starts to have an issue and it fails everytime to sync and send emails. The only info I have about the error is the hiri message "Smothing went wrong" but nothing more. If I delete th eacocunt and the readd again, it start to work properly, but another time after some syncs the issue comes out again. Having a look at the log this kind of issue comes out everytime [Synchronizer MainThread] ERROR 2019-01-15 10:52:53,199 hiri.sync.runner - ('Connection broken: IncompleteRead(2105 bytes read)', IncompleteRead(2105 bytes read)) Traceback (most recent call last): File "site-packages/urllib3/response.py", line 572, in _update_chunk_length ValueError: invalid literal for int() with base 16: b':RoutingType>MailboxXXX, YYYxxx.yyy@abc.comSMTP