I also experienced the same issues using the Verizon Beta 1 on my 6+. While my speeds and coverage increased slightly I would loose a data connection when going from WiFi to LTE or while traveling between LTE towers. I have also uninstalled and gone back to stock.
Is there a 2nd beta available?
Is there a 2nd beta available?
iPhone 6, Verizon
Installed the (beta) Verizon carrier hack patch, didn't really notice any appreciable speed or coverage benefits. But after a few days started to notice failure to activate cellular data network - messages were defaulting to text message, couldn't use LTE data, etc. until I would reboot the phone. So I uninstalled. I think they need to work on the Verizon patch a bit more before it's ready for prime time.