Check none of your power / USB connections are clean and not loose.
I was having some problems like this and it all went away when I shifted to a 5.3 volt power source.
This USB connected Equipment is very fiddly and flaky with voltage.
A pure 5volt regulated power supply in my opinion will cause problems.
The cigarette USB adapters tend to be a slightly higher voltage than 5 volts.
Also some USB cables are very poor and cause voltage loss.