Potterton EP2002 Central Heating Programmer - Intermittent fault

Hi all
I have a Potterton EP2002 Programmer, for controlling my central heating system, which has suddenly started to behave erratically. By that, I mean that it sometimes works continuously for perhaps tweleve hours and then stop working and the LCD goes blank. Other times, it runs for a few minutes and then stops before running again for another few minutes.
I'm buy no means an expert, but could anyone please reassure me that if
I ordered a replacement programmer and attached it to the existing back
plate, it would resolve the problem ?
I'm just guessing that it might be a capacitor or something within the programmer that has failed.
There have been a lot of thunderstorms in my area lately and I just wondered if that might be a contributory factor.
Could it be something else such as the rechargable battery that needs replacing or even the backplate itself that is not providing a good connection ?
I'd be very greatful if someone could please give me some advice on this one.
Best regards David
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