Thomson TG585 - Portforwarding will make internet go for a minute or two and then will remove the forward.

The title describes my problem.



It happens with EVERYTHING I try to forward. I don't know why, but this error is getting me mad. I'm trying to portforward for local tests. I actually did it with SAMP, even though I don't know myself how, it was some rare case. But now, I'm trying to portforward some other things, and it will simply not work.



I will portforward. Everything will work fine for 1-2 minutes, and then, bam, the internet will go. When internet will come back, the portforward will have been unlisted.



This is strange, if anyone knows the solution about this, tell me.



Thanks!