If there is no longer a warranty... but honestly, take it apart... and then? If you're an electronics engineer, you'll certainly know how to help yourself, but otherwise I wouldn't do it.

i have the same problem, is it a coincidence? could you solve the problem?

Dear Mr Grtchakoff
I'm afraid I can't help you there. I gave the Boost to my parents and unfortunately they don't use it.
I hope someone else can help you!
Kind regards
A.Gruner