Oil pressure excessively high

The engine bearing clearances expand with heat which, if excessive, will lower the oil pressure. The spring in the pressure regulator in the oil pump will cause the pressure to drop for the same reason. A partially plugged oil intake screen will work in conjunction with the oil pump to cause it too.

The oil light comes on when oil pressure falls below 7 pounds of pressure. A tapping noise from the engine is an indication of poor oil flow/pressure supply. You may have an oil pump failure or if high mileage, excessive bearing clearances that can cause oil pressure problems.

you need to check the fuel pressure and the pressure regulator. if these are allowing excess fuel pressure then this will happen. also if the fuel injectors are dirty it can cause excess fuel into the cylinders. this excess fuel will not be burnt and cause what is known as cylinder wash allowing the un-burnt fuel to leak into the oil pan. when you find the cause of the excess fuel repair. you need to change the oil and filter maybe more than once close together to rid the excess fuel in the oil.

Oil pump should have a pressure relief valve but hard to know since you're keeping the year, make, model, engine a secret.

check the air vent at the top of the engine it may be blocked. and there is another one at the bottom will see it sticking out and go into the top of the engine. a flex rod should clean it out on the bottom one even an old bit of hose pipe pushed down the pipe should clean it out. then do a oil change and filter.

High oil levels cause the crankshaft to be submerged in the oil. This churns the oil up and causes frothing putting air in the oil and puts strain on the oil pump. Always keep the oil in the proper operating range.

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If the oil level is correct then you might be up for an oil pump. Some engines have an automatic cut-out for low oil pressure or high temperature as a safety mechanism to protect the engine from massive damage.

Look for leaks high on the engine, like valve cover gaskets...

High oil pressure, if you actually had that, would not necessarily exit the engine....Crankcase pressures are not related to system pressure, per se.

Get a mirror and inspect very carefully.. Sometimes you have to clean the engine and test again, as air blows leaks all over (while driving...)

I hate be the bearer of bad news but it sounds like you bottom end bearings are getting worn out. You have excessive bearing clearances causing your drop in oil pressure.