On Mon, 12 Aug 2019 17:33:50 -0700 (PDT), AK
wrote:

I have taken my bike to 2 different shops to have my gears adjusted.

They do not shift properly and end up "clicking" instead of shifting into the correct gear.

I have had 2 shops adjust the bike and the adjustment never lasts more than 3 or 4 days.

My chain and all components are very clean.

What's is going on?

Andy

In my experience (for whatever that is worth :-) if the shifting
changes dramatically it is usually something like a misaligned shift
cable housing which allows the housing to move after the adjustments
are made, or even a poorly tightened cable clamp.

I've also noticed that after the shifter is adjusted that in a day or
so it sometimes requires a bit of added adjustment - maybe a part of a
turn of the adjuster (if there is one) - and once that adjustment is
made satisfactorily than things remain the same for months.
--
cheers,

John B.