How many of you have seen a power drop with the LGU's?

Mine to start went warm, i swapped the spring to a 5mm shorter LGV spring and with 2mm additional preload it was back at 11.2...however tested today it had dropped again to 10.7 or so.

Now i think I know whats causing it, but i was wondering if anyone else had found their LGU had lost power or if any RFD's have seen guns back with low power issues?