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You did not post what model series it is. The age of the batteries can have a lot to do with this. When the sensors on the battery detect low voltage, the unit returns to the dock. If the dock is not charging the batteries or the batteries are old and need replaced, the unit will do this.
Sometimes the contacts between the battery and the iRobot get corroded...you can try using a small piece of sandpaper to lightly scuff/clean the battery contacts. Once you put it back together, try the reset function mentioned previously.
I sometimes have the same problem with my Roomba 530 (named Ethel). Make sure the signal transmittor on the docking station and the signal receiver on the top of the Roomba are clean. You can use a cloth or paper towel with a SMALL amount of window cleaner to run around both of these signal devices. I also like to clean the metal contacts on the station and the corresponding contacts on the bottom of the Roomba at the same time. This won't make a difference for the docking but it just assures that the vacuum will charge efficiently. If this doesn't work, you might need to have the unit cleaned professionally unless you feel comfortable about taking the unit apart and cleaning it yourself. I did this and Ethel has worked fine ever since! If this helps, please come back and rate my suggestion!
I had this problem and contacted irobot. An important fact was left out of the early edition user manual to not leave the battery charging for an extended amount of time. Because of this ommision, they sent me a new battery and a software upgrade for the scooba. I just followed the directions and attached the little device they sent to do the upgrade the scooba and it fixed the battery problem.
Need more info.
Does the unit go into search mode? "SPOT & CLEAN" flashing? It actually tries to search?
Do you have another roomba to test your dock on to see if IT will dock? If it tries but just cant, then either the dock transmitter, or the roombas receiver is dead. (The round antennae thingys on the dock and the bumper) replace these would be the first point.
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