I have been having issues with then handoff between wifi and cellular connections. The cellular doesn't seem to register with Siri, radio, nor do I get my notifications like I did before the beta. Sad
Well, as outlined in the release notes: "The Radio app doesn’t currently support Cellular connections. (34422913)"
As for the other issues, since you're part of the developer beta you probably should file a radar about those problems. Do a sysdiagnose on the watch while the issues are happening and include it with the reports.