Multiple Gremlins at one time power locks
 

So recently I started having inconsistent results using my fob.It started out being the rear doors weren't unlocking simultaneously .long time ago I did notice it was just one but not all the time ,but that seemed to go away...so fast forward in time and the rear power locks stopped working together off and on.I definitely have an issue w proximity and the fob working.... Then I noticed the tailgate joined the problem party, again intermittently....ok.....so as this problem was popping up in and out,one day the fuel gauge went dead. Within minutes the guage functionality was ressurected and continued to cut in and out .in Subsequent days that varied but now Simultaneously all together ( rear doors tailgate fuel gauge and NOW gas filler door simply do not work.)I have A:changed the relay I believe is associated w these B:disconnected battery. Another thing is neither front power door button does anything to help the matter and the key itself yields the same result.front power locks only work w fob or the control on either door or the key In the cylinder. do not hear power anywhere a"click' at the areas that do not work.......need some insight!!!