That's all there is to it really. There's a software bug on PS4 OS level, where if you use PSVR for a while (few hours is all it takes, if that) the tracking error accumulates. You can either play one game continuously, or play a number of games, it doesn't matter, the bug is really on the OS level, and the only solution is to power cycle the PS4. Going in and out of standby mode doesn't fix the issue - you have to power off then on. For me, the games went from seizure-inducing to practically perfectly stable after power cycling, but you have to do it after almost every game session.
It was a revelation to me when someone here pointed it out. I thought that my headset was busted after it worked fine the first day.
I mean it's an embarrassing issue for Sony TBH, and incredible that it was launched with such a "beta release" bug, and still not fixed. They should at the very least acknowledge the issue and let people know what to do to fix it.