Feels like someone's hitting the kill switch

[helmetvonthrob]

I know this is the thou. forum but I wonder if anyone has suffered from this??[/size]

This started about 10 days ago.[/size]I was splitting lanes on the M25 and needed to do a 2 lane split so found a gap and shut the throttle whereupon the forks dived and it felt like the engine had died.  I got into lane, made some space then shut the throttle, pulled in the clutch and it stalled.  I let the clutch out and it re-started.  It had a bit of an on off feel to the throttle response.So I got home and tilted the tank, checked obvious pipes off, no joy.  I opened the airbox and it does need a new air filter (I've got one on order).  I dumped a load of injector cleaner in the tank.Put the bike in during the week to a local independent for the throttle bodies to be balanced as it was getting a bit flat at low revs, plugs and an MOT.  It's come back with less of a flat spot and keeps going better at the top end with better fuel economy!I went to deepest Kent yesterday and coming back I got the same effect.  Sat in the contraflow on the M3, I got to the point where I could just make the bike skip a beat at a certain throttle opening, just like an occasional misfire.  Pulled the clutch in as I approached my home parking spot and the engine cut out again.
I guess this could be caused by heat build up as I was travelling at "ahem" mph round the M25 before trundling through the roadworks @ 50mph for 16 miles.I am thinking from what I generally know about cars that it could be a faulty throttle pot but I don't know enough about the system to say for sure.Anyone suffered from this or got any how tos on things to check??