Signal drops every 30 second after upgrading Tmobile Lumia 640 to W10 build 10586

W

WPCentral Question

Hi, I really need someones help here. I was really excited to install the TP of windows 10 build into my T-Mobile 640, and I did that a few months back but had many problems so I decided to wait until now that it is a more mature build.
Everything works great except for one thing. The cellular signal drops very often. If i stare at the screen it can drop every 30 second or so and it takes a couple of seconds and comes back and its like that all the time. some times it takes longer to come back but it is a loop.
i tried to re enter the APN settings and still does it.
Can some one please help.
Thanks
 

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