location issue?

Howdy, I've had a BIG problem since May 4th. Every time I log into my account, no pokestops, gyms or pokemons show up. I log on other accounts from my phone and on the others everything worked. when I want to use daily incest its shows me "Failed to detect location (13)". It definitely can't be a GPS problem because other accounts work without problems. I can use other things, such as receiving gifts or hatching eggs. In 2 days it will be a month since I received the issue. Its just happend through night when I was sleeping, I have tried everything: I was looking for the problem on the Internet, I tried writing to niantic support(of course they were useless. I think it might be a 30-day shadow ban, but I'm not sure #