jtw000

I know this is a very slow forum but I have an ongoing issue. The bike struggles to start first time, then works fine for a few weeks after having work done... any work. Any poking around in it makes it run perfectly well but then it slowly picks up issues. The issue is just she doesn't like starting, hot or cold and it takes progressively longer as time goes on.
On my machine, everything has been done, worked on and fixed so I'm running out of ideas.
It struck me that perhaps the auto-choke is the issue. Maybe it's sticky and progressively gets worse after playing with it? Could anyone with slightly more, or better, technical knowledge than me give me any pointers? There are two electrical contacts on mine, one seems to be a TPS (throttle position sensor) and the other, I presume, is the auto-choke.
Is there anything that can be done? If this is an unreliable thing, it could be contributing to the problems listed on a lot of threads here?

Thanks

Jack