The EventQueues are flooded with Notification Server Events (NSE) coming from Cloud-enabled Management (CEM) agents.
The NSE's are "capture basic inventory" events and come in about every 5 minutes, this can flood the SQL server and cause deadlocks.
A permanent fix has been implemented in 7.5 SP1 HF5. (See DOC7954)
SMP 7.5 HF4
SMP 7.5 SP1 HF 3