Just got the new 6s+ coming from the 6+. I got the sim-free version. I am having issue with my T-Mobile LTE signal varying wildly while sitting in one place. I can watch it go from -88 all the way to -140, No Service and then to -100. It's all over the place with no rhyme or reason. When I setup my phone I did it from a restore but reset network settings. Any one have similar issues?