Seats in the main valve body are leaking by, allowing water to go to the shower head.
I'm not sure about the sharkbites causing the problem. The root of the problem is that the water flow through the tub filler spout is restricted somewhere, and that is causing the water to gradually rise up to the shower head. The restriction could be anything from solder that seeped into a joint to a kinked piece of tubing or to using too small diameter tubing to the tub filler. Find the restriction, fix it, and the problem should be solved.
This is dependent on the shower head, pressure, and a number of other factors. However, if you look at shower heads at the store, they will usually say something like "3 GPM" or "1.8 GPM", meaning gallons per minute. Many of the newer shower heads that are energy efficient have a regulator on them to restrict the flow, and therefore the gallons per minute that the head uses.
Engine coolant leaking into cylinder. Possible bad head gasket.
A head gasket replacement should definitely be covered under a power train warranty. As long as the dealer does not find a cause for the failure and attribute it to poor maintenance or something else that you could have done to cause the failure.
cause.
A dirty or clogged screen can cause the low water presser remove shower head and clean. If not it could be calcium deposits built up on shower head if so soak shower head in a cleaning solution for several hours if that dose not work buy a new shower head. (note some shower heads have a low flow re-stricter in some cases you can remove this and get more water pressure)
It would have to be the controls or the shower head. Distance from the heater or size of supply lines shouldn't have much affect. The only variable would be the control or shower head and either one could have a flow restrictor in it or both.
you have trash in your line take the shower head off and remove trash or possibly in water valve at shower
'In the shower' would be correct as the world 'shower' does not strictly define the shower head.
When you pull the stem up, it diverts the water from the tub spout to the shower head. Somewhere between the valve connection and shower head arm, you have a leak. The easiest part to check would be the arm that comes out of the wall that you screw the shower head on to. It is normally screwed in to a "shower Ell" and that connection and or pipe is easy to crack if someone pulls on the shower head. Pull the escutcheon plate towards the shower head and try to see into the hole and look for water at the connection. It would only leak when you are using the shower. If it is another connection or the riser pipe itself, you'll have to access it through the wall, hopefully from a room on the opposite side of the wall. Good Luck
Sediment
The obvious answer would be the shower head but if anything else were on the shower you would have to search somewhere else
Check the shower head and clean and flush it. It may just be a little particle of junk in the head restricting your flow
cause there stuck to your head
Masturbate. I'm not sure why you would need a shower head. You can do it in a bath or before bathing or any place else.
I would like to buy a new shower head. Which options are available on the market for shower heads?
if its just a shower and no tub spout then it most likely must be in your shower head and if its a hand held shower head (with a flexible hose attached) it most likely has a bad seal or some other way which allows air to get inside and drain the water out slowly. The same can be for a shower with a tub spout diverter and the shower head has a bad seal thus letting the water drain down the tub spout and it can be a real slow leak to cause the squeaking noise 20 minutes later, my guess of the squeaking noise would come from the air being pushed inside the shower head.