I started 780 and Simplera on August 27 , yes I had problems on some sensors not lasting full 7 days or not reading , I found it was the placement of sensors - I was putting them too far back or not where there was a lots of fluid , the alarms are bothersome but it is worth sticking with it , it does get easier as the pump algorithm learns , I still have alarms but I do calibrate when asked , and sometimes the pump won’t accept the BS reading and I have to repeat in 15 mins ( once 4 time ) but I guess it because my BS rise and fall rapidly . I now glad I have this pump my Hb1 result has gone from 98 Aug to 64 last week ( I have never ever been under 70 in 30 years , pumping 10 years .