Another one bites the dust

Weds 1st Feb, 2:15am - woken by alarm on VAC pump unit. "Internal Device Error".
Can't get nurse to change dressing at this hour so hope that morning will be soon enough.
Nurse arrives at 9am and replaces with conventional dressing.
Replacement pump arrives at 11am.
Excellent service all round but I do wish they wouldn't break down. Perhaps we live on a ley line or something equally spooky