Changed psu seems to have sorted frenzy but cashbeast problem still there
Normally it sorted issues like mine with overly 'bouncing' reels, which often included the number reel, but it sounds from the 'banging' like there may be some physical issue with the reel or mount. Have you made sure the mount itself (I assume it's push-fit?) is definitely securely bolted to the glass? I've had some come a little loose with age and this can cause annoying banging e.t.c.
For god's sake don't overtighten though, I've never done it but I'd imagine you could break the glass if you did. Basically just get a spanner on it and see if there is any slack, if there is then lightly turn until there's no slack, don't go crazy like you would metal > wood or similar 
Edited by Bencrest, 09 May 2014 - 03:17 PM.
Ben
Hopefully recovering from years of compulsive gambling and wanting to be gamble free forever.
Recommended reading -
http://www.gamblersaloud.com/ (yes, I bought the book, very happy with it!)