the phone is new. sprint is updating towers across the country. this is their first LTE device. there will be bugs. you guys and gals are on the bleeding edge of mobile phone tech right now, so you have to roll with the punches. it will get better.
i would suggest if you are still seeing these issues after a solid week of use, give sprint a shout and have them troubleshoot. could be a defective phone, could be intermittent issues with the network--only time will tell.
once i get my MSL im going to chance my slot cycle index.
"whats slot cycle index marc?"
well im glad you asked...
here smoke this thread from yester year...
Ring Delay (Slot Cycle Index)