I had the same problem about a month ago after I ugraded to playon premium. The advice I received worked perfect! My setup is win 7, xbox 360, hard wired to router. I was told to delete the playon pluggin software and reinstall the full version (not the update!) and BINGO! It works flawless again. I did have to reininstal all my scripts again but found that not only did it update all the scripts but cleaned out a lot of old unused scripts. it took a little time installing it all again but well worth it. Also just in case the playon doesnt remember your license number you should write it down.
And anouther suggestion that I tried was the Megavideo premium account. WOW, I bought the 3 month for 20 bucks and now all the mega video movies in tvlinks are fast downloading and no time limits in much better picture quality and almost always available. Well worth it if you have few bucks kicking around. Good luck.
Thanks for your suggestion. I will try it. I know that I have done this once already -- uninstalled PlayOn, deleted any databases, reinstalled full version and downloaded all plugins and scripts, but I just can't remember whether I did this BEFORE or AFTER I signed up for premium. Anyway, it's worth a try, but I'm not sure it's going to work because I recall doing this once.
As for Megavideo, I think I got referred to that site once -- maybe from this forum -- and I recall signing up for what I thought was a FREE account or something like $4.99, but then I noticed that there were going to be recurring billing charges. I rembember having to cancel quickly. It may not have been that particular site, but I remember that I incurred a charge but never got to use the service because I had to cancel to avoid getting regular charges. I'll have to look into it again if it sounds legit and works with PlayOn.