Disco 1 Strange central locking event

Parked up and pressed the alarm fob to lock then after a second or two it unlocked itself had to lock it 3 times before it stayed locked .when I started up had no indicators,brake lights or hazards found No1 fuse under steering column had blown (indicators and brake lights 15amp) and no4 in engine bay (hazards 30 amp).tho all seems fine now but does anyone know what to check for or cause incase it does it again?.