F Jazz quiet/loud pick up problem

[davelliott]

Hi

Really not sure if I'm barking up the wrong tree with this.
I have a 2008 70s Jazz. Have had it about 6 months or so.

I've noticed at our last few practices that volume will drop after say 30 mins so I then crank up the amp volume. Later on, all of a sudden, the volume returned!
At our last practice though, the volume had to be cranked up from the start, then when I was pissing about I slapped about a bit (ahem), and the volume returned! I think it was because the string hit the pick up.
Could it be that I have a 'sticky' pick up? Is this possible? If so is there a simpleton's cure or do I need to see our local expert?

I had suspected my amp (TE 7215SMC GP7), but had no probs with my other bass (Epi Thunderbird).

Any ideas gratefully received. Don't want to start poking about with critical bits so if it's an expert's job.....

Cheers
Dave

[gjones]

Have a look at the wiring, there may be a loose connection somewhere.

[davelliott]

[quote name='gjones' timestamp='1486814702' post='3234720']
Have a look at the wiring, there may be a loose connection somewhere.
[/quote]
Cheers.
Had a rummage and doesn't look like there's any loose wiring. Found some gunky stuff around the pu poles, have cleaned that off. Now giving it a test before the Mrs gets in!

[Norris]

Do you rest your thumb on the pickup? It could be that you are inadvertently pressing the pickup into the body and it's just catching on the screw threads rather than popping back out