Did you stop using A/C? Before this regen incident I did have one straight week where the bars wouldn't budge at 7 bars and the only thing I did different was the weather was cooler and I barely used the A/C at all.

Every time I have encountered a forced regen (again except for this incident they've all been moving regens) it has gone ahead and charged it all the way up to 7 or 8 bars and would spend at least a day or two at those levels.