Berlingo won't crank over just clicks when key is turned

[Kevinallen]

Berlingo 1.6 hdi some times won't start or even crank over. It's only happens a few times but it's been worse lately. I get in my van turn the key and all you here is a click sound. I can some times just disconnect the battery and re attach it and all is fine it turns over like it should .Has any one any idea what's going on ??  I left work yesterday and it did the same thing but the battery had died so I had to jump start off another car. all was fine after about 10 miles the ABS light came on I parked up and turned of the engine to see if the light would go off it did , It then Wouldn't  start just made a clicking noise had to get a jump start again. The ABS light then disappeared and I drove it home another 15 miles all fine. Parked up and after my tea I went out every hour and this morning and it's started first time every time off the key . Any ideas advise please thanks guys I'm by no way a mechanic