UR824 Causes Nuendo to pause

My UR824 seemed to work fine for awhile but then wierdness started. Evey few minutes Nuendo will pause for 30 seconds and will do nothing. Then it’s fine again. After investigation nearly everything I could think of I stopped using the UR824 and changed to the Generic ASIO Drives. Bam! Problem fixed.

Is it a USB thing on Win 7 64 bit?