New system having connection difficulties

I have been with SimpliSafe for years now since (Aug 2011). My older equipment worked fine. I just bought a new system to include new devices. On the first day an Entry Sensor did not work, you are sending a replacement, thank you. Now on the third day the Base Station does not have the ability to Refresh (can not communicate with SimpliSafe) using my computer or the Android phone app. This happens only on Battery, works when plugged into AC power; so now you are sending a replacement Base Station.  I am a bit concerned about the reliability of this "New Equipment".