I'm just looking for ideas on recommended next steps. I'm not super experienced / capable with auto repair and I'll end up having to pay someone to do anything complex, so I'd just like to not spend money on anything that isn't likely to be a fix.

2011 Chevrolet Silverado LTZ 5.3L with 176k miles. Back in Nov 2024 first experienced the often-reported sudden drop in oil pressure (engine lights, bells, warnings to stop now). I replaced the oil pressure sensor at that time. Then a few weeks ago it happened again.

Here's what I know:
- drained the oil through a 190 micron paint filter - small amount of very fine black/dark brown grit but nothing shiny or metallic (see image)
- unfortunately I didn't think to tear open the oil filter to inspect it for metal debris...
- on startup oil pressure is right below 40 psi and does climb some as I give it some gas
- oil pressure will maintain between 35 and 40 psi if I drive it 45mph or less (which correlates to probably 2.5k rpms or less)
- oil pressure begins to drop (and usually goes to zero per the gauge) once I get up to maybe 50mp or over 3k rpms
- once the gauge goes to zero, if I stop, turn the truck off and wait a couple minutes, the pressure will go back to 35 - 40 and off we go again...
- no oil leaks and it is not burning any oil
- no ticking other unusual engine noise at all - sounds like it always has the last 150k that I've owned it
- no loss of performance at all, even when the oil pressure gauge is reading zero
- as noted above, oil pressure sensor was replaced...but I have zero idea if they removed / cleaned / replaced the little screen in there (I am suspicious they did not)
- garage that installed the new pressure sensor also drove the truck with a manual oil pressure gauge and observed loss of oil pressure at higher speed / rpms

There are a lot of online reports of the little screen behind the oil pressure sensor getting plugged up and causing this kind of thing. I realize it could also be the oil pump, but I'm not sure if an oil pump can somehow work differently at lower versus higher rpms (and I suppose pressure). I read that it could also be the oil siphon tube/screen plugging up due to solids floating around in the oil, and I guess when the engine is working harder it's pulling more oil in and maybe also pulls in enough solids to starve - worst case being bearing shards I guess.

What should be my next steps? I'm thinking removing the filter behind the pressure sensor and see if running without that results in steadier pressure at higher rpms is a good first test. Then what?

Thanks for any thoughts.