The Connection Timeout error is unfortunately still a mystery to us for the most part. It is usually the result of a localised networking issue.
We have some solutions here you may not have already tried: https://support.fatshark.se/hc/en-us/articles/360034654113--PC-How-to-Resolve-SIGN-IN-TIMEOUT-COULDNT-CONNECT-CONNECTION-TIMEOUT-COULDNT-RESOLVE-HOST-Errors-