Possibly battery low on charge problems. Is quite common for Jaguars to have low battery charge problems showing up. Usual advice on this forum is to invest in a CTEK Re-conditioner/ Charger (other makes are available, as the media would say) and use it very regularly and for extended time to make certain battery is always in good condition and well charged.
This should be the start place and if that does not cure the problems, then read the codes that may have been generated, and see if there is relevant information stored there.
Best Wishes and Regards, John