dodgy alarm on v70 2001
 

volvo v70 2001 alarm been very erratic of late, turning on when it wanted, but yesterday , alarm came on and wouldnt respond to key fob. Carried on going off until alarm ran down . Trouble is straight after, immobiliser must of kicked in, as no power to car at all, no lights, nothing on dashboard,no central locking, totally dead...... any suggestions