While you’re waiting for a reply from Tim, let me post:

Honestly, I don’t think a replacement 502 will be better the mine. Seems like they all loose registration. I’m waiting now to see if PAP2T you guys are using is the solution to the problem. Time might show that it’s not the solution and another problem with PAP2T might come up. If you, PAP2T users, confirm that it is reliable then I will probably order PAP2T and buy a router, or switch to another provider.