Since I got my phone in early March there's been three or four times where it gets glitchy. For example it will not respond to "hey Siri". Yesterday it wouldn't respond and also watching a YouTube video the volume wouldn't adjust using the on screen slider. The buttons would adjust the volume but the slider stayed in the same position it never moved with the volume rocker. When this happens I power cycle the phone and all is good again. Just wondering if this is the norm, can I check anything and has anyone else had anything like this before. iPhone 6s, running 9.3.2 on Verizon. Thanks in advance