Just seen your also running off battery power and not wall outlet try this as it may help for problem #3 Brendan who posted above does tune up's for these mounts to help take periodic errors out this would be also help out alot. I have read of metal shavings and fillings being found on the worm & gear this would result in the mount jumping so radically. If your a diy self person you could to a clean and re-grease, if not send it off to him as by the looks his got an art for it. He also adds shims and does a very nice worm alignment at a more then fair price and a few other fix's, not selling his service but if you aren't confident i would send it to him.
Disable the
USB selective suspend option. To do this, follow these steps: 1. Click
Start, type
power options in the
Start Search box, and then click
Power Options in the
Programs list. If you are prompted for an administrator
password or confirmation, type your password or click
Continue.
2. Under the selected power plan, click
Change plan settings.
3. Click
Change advanced power settings.
4. In the
Power Options dialog box, expand
USB settings, and then expand
USB selective suspend setting.
6. If you want to disable Windows 7 to turn off the USB root hub click
Disabled in the
Plugged in list, and then click OK
If that doesn’t help, then I would suggest you to create a new power plan and check if it fixes the problem.
Refer these links for help:
Change, create, or delete a power plan (scheme):
http://windows.microsoft.com/en-us/w...er-plan-scheme
Power plans: frequently asked questions:
http://windows.microsoft.com/en-us/w...sked-questions