Pulsar 2015 , Car is mostly running smoothly , no starting issues . There is an issue with the cruse controls , they keep disengaging randomly - I did a scan and came up with this error : P0356 , camshaft position sensor B, circuit bank 1 , current / pending / permanent .. when I cleared them the permanent stayed and the other 2 went away till I drove the car .

I replaced the sensor with an after market one - worse

I replaced it with a genuine part - a bit better , but still issue .

I’m thinking a faulty wire or morn likely a stretched timing chain / tensioner or worn gear cog … anybody got any better suggestions ? Or had the same experience ?

Thanks

That is a sensible conclusion and maybe worth removing the valve cover to get a better view of the chain and tensioners (endoscope is good for observing further down inside the engine.
If wear is obvious on any components then maybe worth planning to put a new chainset in the engine