E36 One Touch issues

The one touch function works fine to put the window down, every time, without fail.
If I lower the window without letting it go all the way to the bottom the one touch function will work to bring it back up.
However, if I let the window go all the way down to the bottom the one touch function stops working altogether necessitating a re-initialising process (i.e. holding the up button for a couple of seconds with the window closed).
Also if I do not re-initialise the one touch function will not work at all at any level on the way back up, but the way down still allows one touch.

I hope I have explained this adequately enough, it is different than the usual one touch stops working altogether posts. Anyone experience this issue before?

Note: I replaced the regulator with a genuine new unit 2-3 years ago too. This problem only started to occur this week.