So I bought a 7a have had it for a week I got it for Graphene OS I tried stock Google android for 2 days I had to toggle airplane mode for a working data connection over a dozen times each day battery was crap and phone got super hot unable to hold it. I have now spent a week with Graphene OS and wow No data issues at all signal is great. Also phone doesn't get hot just a lil warm when doing something like gaming battery is miles better. Also on stock android the launcher would freeze and you had to lock and unlock the phone until it unfroze and it did this dozens of times 3rd party launchers had the same issue. So my conclusion is it's a great device if you run something other than stock Google android.
Yes it was up to date latest version February security patch and all also my hotspot didn't work got verification failed Google Support and my carrier could not fix it and then the Google support rep said if Graphene OS worked better then the would just go back to if it was them like what you recommend I go to graphene OS I thought it was funny.