Ok, I think I fixed it. It seems like my router was set to a channel that was already occupied by a very weak signal from another house. I changed it to something else and it seems to work for now

Thanks for the reply! The router says this: Firmware Version:0.9.1 0.2 v0026.0 Build 160413 Rel.41580n Hardware Version:TD-W9970B v1 00000000 Don't know, if it's the latest one, on the support page...

Model : Hardware Version : Firmware Version : ISP : Hello, I've bought this router less than a week ago, and since I started using it, the wifi sometimes just restart for no reason. Lan connections...