I recently had the same problem on the Superhub 2 wifi. After waiting 2 years for the promised hub 3, that never materialized, after repeat requests, i finally bit the bullet, bought a ASUS router, connected to the virgin hub (all it's good for is router mode), and guess what, no more dropouts, even with about 15 devices connected, and faster speeds. Thanks for nothing virgin, the only reason i'm still with them is the now, stable, constant connection and speed, at considerable cost for the ASUS router that is up to the job...