This is a nice feature of PL, unfortunately for me, it's also one which seems to malfunction very often, mostly by making my computer stuck in power saving mode. This has been an issue since this function was introduced, I'm sorry to say.
I'm not sure if this in anyway can be realted to the multiple user accounts I have on this computer, or maybe hibernate mode, or perhaps something completely different.
I wonder that did this happen too if the name of Power Plan are in English?
And what's the log said?
Did it showing the power plan just don't get switch back to Forced Power Plan while active?
I think it can be the name, or it don't detect the user is active.
And did you tried disable UAC?