Anyone else having intermittent issues dead locking the vehicle (without using  the remote fob)? Works most times but often it just doesn't which is annoying.

Does it seem to relate to not working when it is wet or exceptionally cold temperatures?

No problem with mine so can’t help I’m afraid 

Sorry I’ve just found this site, I use the “https://www.fpaceforums.co.uk” site.

ive had an fpace V6 Diesel since 2017. 
there is a recall on the door sensors, they replace all 4 door handles, have to paint them to match car colour.

get your dealership to look up “JTB00578 - keyless entry is inoperative or intermittent”    03-August 2017 08:15:06   

hope this helps.  Also log on to JLR Topix site using your din number to check what faults are related to your vehicle.