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Your bump sensors are malfunctioning. The best thing to do is order a repair kit. I ordered mine from EESolutions.ca and it worked great. I'd recommend them..
Remove all three wheels and make sure they're clean. Tap the bumper with your hand, and maybe blow out behind it with compressed air. If the problem continues, call us-- it's in the wheel motors, most likely. 1-877-855-8593.
Do you have it set on "spot"? This causes Roomba to start out in circles, expanding and expanding until a certain time and then returns by going in circles, making smaller circles, until it gets to its starting point.
I had the same kind of problem with my model 400 today...after starting it and having it go in a circle for 30 seconds or so it would finally run into something and then back up a few inches, turn, then go forward a few inches, then back up a few inches, turn, then go forward a few inches, etc., etc.. I tried cleaning off the four pairs of sensors under the bumper and blowing out various things underneath (by mouth since I didn't have any canned compressed air). It didn't really help. It then occurred to me that I had a leaf blower! I put the Roomba upside down on the grass, put the leaf blower on high, and blew at it from all directions and up close. More dust came out than I thought would. It has been running normally now for the last 45 minutes.
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