Only started experiencing the random disconnects from wifi etc once upgraded to 10.1.
As a matter of interest to everyone what was discovered is that BB10 does not like choice - that is to say if your wifi router has the option for 802.11b/g/n mode then set the router to the highest option only (ie 802.11n). In this configuration my phone never disconnects or times out when trying to connect again when going in and out of range. Don't set the router to automatically chose a mode or enable b, g and n, only set it to one mode and the phone behaves.
My Z10 does support 802.11n but only connects at a maximum of 65MB/s.