Central locking gremlins....

Just after a bit of a point in the right direction, collected my disco 2 last night and all was well. It unlocked and locked fine. Went for some food on way home and when I pressed the unlock button the drivers door didn't work. So I used the key and got in. Drove home and the car locked fine. This morning it unlocked fine and I drove it to work. Come lunchtime same problem but this time it was drivers door and the rear passenger side door that didn't open.

So, before I start stripping door cards at the weekend and trying to see if there is any loose wires. Is there anything simple that I could look at?

Thanks in advance and apologies for this being my second post and asking for help already.....

Cheers Andy

It could be the receiver in the headlining.

Does that affect certain doors opening and not others? It locks them all every time just only opens some

Sounds like the central door activators are getting a bit lazy . Try pressing the fob button a 2rd time next time one fails to open this normally open the lazy one . It's a common fault it's always worth checking and cleaning any electric contact points

Mines does this at times. I find if I lock it again and then unlock the drivers door knob pops up OK. Doubt its the receiver as it wouldn't open any doors if it was In my opinion.