About a week ago I upgraded firmware (yes it's old firmware I just never did it). But after a week no problems with the firmware.
One is a little more babysitting with the X's but that was same before. Other works all days if not weeks no problems.
What is the firmware date that you are using now?
I went from stock batch 1 firmware to the "SD-C1-20141217.tar" firmware. So it's retaliative old but I just never got around to doing it.
But it's working for me just as good as stock did, so no regrets on updating.