Well, the *original* reason was that his clones kept trying to call all of the phone numbers they could remember to try to figure out what was going on and/or get their old life back - but the occasional Christmas card from the Professor would certainly be enough to set off another round. By now I imagine he's gotten reasonably good at it. At some point someone might want to try picking him up as a secret agent. He's desperate enough, he's broken enough, and he can build himself a solid cover identity as a plumber/handyman anywhere in the country with two week's notice.
When he finally *does* find out about the 'wave-built tracking device surgically implanted along his right femur, he's going to be *pissed*.
When he finally *does* find out about the 'wave-built tracking device surgically implanted along his right femur, he's going to be *pissed*.