Had the weirdest issue with my Draytek Vigor 2920n router the other day, so a mate came over the other day and enabled the wireless on his HTC One X mobile phone, two seconds later my Draytek started continuously rebooting.
It would come up for a few seconds then reboot again, over and over.
So turned the wireless off and bam it was stable again!!
Had a flick about the internet and few other people are having the same issue, so contacted draytek.co.uk who have issued me a beta firmware for my router (beta_0414), so I’ll have my mate back over and let you know what happens!!