Are the tests all from the same batch? Could just be a compliance/QA issue.
Since I've had reason to do some digging on false positives the past couple of days
...they are pretty rare, and what was found in a particular study was that there was a bum batch of tests that resulted in most of the observations. So yeah, mixing up batches/brands is good.
Also, Paxlovid can drive you towards a negative result, but there can be a rebound and you start testing again. All that business about reinfection wiith omicron a month after having it the first time was very likely actually just Paxlovid rebound.
We had a carpenter in on Thursday to put in the baby gates and cat door for the basement...he took a test on Thursday night on a lark, and showed up positive. He was wearing a mask throughout (he's hyper careful, he's had a recurrence of cancer), and we were most of the time, but of course the baby wasn't. We're all a vaxxed as we can be, but this is really not making things fun at the moment. Odds of long Covid off omicron seem to be about 5%, but it will really fuck things up if you are in that 5%. To that point...
My cousin (mid 40s) got it in ~May. Not long before that, he had to switch up some of his psych meds, as the ones that had worked for him for a decade went out of production for some reason. Well, ever since he had Covid, has has had significant post-acute CNS issues, to a point where he couldn't even work anymore. His psychiatrist was trying other meds, and this culminated in my cousin winding up in the hospital after yelling at the cops that he was Jesus. After that was pretty rocky, and he wound up being involuntarily hospitalized again starting the night before Thanksgiving, for a week. What a fucking mess. Well, I think I figured out what happened. I stumbled across something in the literature about inflammation and increased permeability of the blood/brain barrier during/after Covid. So, I think he was effectively getting mega-doses of his meds, which sent him into psychosis. Why I had to be the one to figure this out, and not his fucking psychiatrist, well....