mobile

Just upgraded from my M7 to the S6 Edge last Sunday. Since then the S6 has randomly disconnected from both voice and text service twice. The display indicates strong signal and that it's connected but no incoming calls or texts go through. The first time required a reboot to regain connectivity and the second time it took over 5 minutes before it returned. Attempts to make outgoing calls timed out with no connection. Do Not Disturb mode is off and the phone is provisioned correctly. There's no warning that this is happening until someone contacts me using an other method. Any ideas?