They ran out of fuel, so they just drifted around for a while.

KD Perdana's boat ran out of fuel, says Navy chief

KD Perdana adrift ran out of fuel 

communication equipment failure

unable contact mother ship

RMN chief said preliminary findings why boat went missing 

lost contact conducting operations to chase away foreign fishing vessels

communication equipment broke down

- Bernama

My comments :  Ran out of fuel. Then comms broke down.  Maybe the radio runs on diesel too?    

There is always a first time for everything.

What about the cans?  Can they flush? 

Toaster in the galley can toast bread?  They dont serve toast?  

There is always a first time for everything.