With both types of error codes, It sounds like you might be have a Controller card problem. Bug codes are software related so it could be corrupted data that will clear up with a ini. but I wouldn't make that call for you, as if it is Hardware related the component might fail.
I have friends that are Vendors and they never were too worried about this code even when combined with other codes unless there was a system impact, so it's really up to you how far you want to take it. I slowed this down on the switches that I was getting the codes on, by checking the grounds and doing an ini. around twice a year to keep my systems cleaned up, but I never have been rid of it completely.
If it's one of those annoying things you can't live with, call in a Tech. support team and give them the info and see what they tell you. Good luck and I hope it works out.
also at what point is your MM locking up and what loop is it on? we might be able to help you with that.