An external interference could cause creeping mouse syndrome, although usually only if the mouse battery is on the low side.

Assuming that the "receiver" plugs into a USB slot, other USB devices could be giving you some cross-talk. USB usually is a lot better than the old serial port connections, but requires some management by the computer; and sometimes the computer gets "fuzzy" about the connections. especially if you have several devices that you connect/disconnect fairly often.

We've found that when our cell phones "ping" their connection, one computer burps in cadence with the pings. Another computer doesn't make any noise, but occasionally (rarely) the mouse takes off for a brief wander. This happens only if the phone is very close to the computer (And shouldn't happen at all, but the ones affected are all consumer grade equipment).

And as several have mentioned, the surface the mouse is walking on can make a difference.

John