Nexus 7 keeps rebooting in Canada

hokusai357

    I have a Nexus 7 (2013) 2nd generation tablet with T-mobile One plan. Since our place is near Canada, we often go there for shopping, etc. As soon as we cross the border my Nexus 7 keeps rebooting every 5-10 minutes. It's supposed to be able to use data in Canada, but in order to use the internet there, I have to remove the sim card and connect public wifi. As long as the sim card is in it, even with the airplane mode, it keeps rebooting. I went to a T-mobile shop, and they gave me a brand new sim card to try, but it didn't work either. There is of course no problem when I'm in the US. I'd appreciate any help.

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