Please help!

[midden]

if it was fine and then all of a sudden had a problem that'd most likely point to an electrical problem. tps seems to fail quite a bit as slappy said. might be the regulator rectifier getting hot. you could measure the voltage going to the battery when the bike is hot to give you an idea if that's working. or it could be a problem with the alternator. you could check the resistance of that and the voltage it putting out when that's hot. you could have a look at your air filter too. it's unlikely to be the problem if it only happens when hot but worth a check. if it's blocked it'll cause problems with hard acceleration

I would say air filter first (mine wouldn't accelerate passed 7k)  and then if problem isn't solved go down the plug and lead route (trimming couple mm of)