Boiler or remote problem ?!?

Hi all . We seem to have 2 issues, but Im not sure if theyre linked. We have a RDJ10RF remote.
The initial problem was that our boiler was just randomly starting up in themiddle of the night. Usually around 4 or 5 a.m. But never at the same time or at the same temperature. At that point turning the dial on the remote wouldnt stop the boiler.
This seemed to start just after i changed the time on the remote when the clocks went back an hour recently.
During the day we can turn the dialler on the remote to switch the boiler off /on, so it is talking to the receiver in a fashion.
I have also now noticed that the timer on the remote doesnt work i.e. boiler doesnt come on /off at preset times.
Do you think its all related to the remote , or do we have a boiler issue as well.
Is there a way of disconnecting the transmitter , to see if the boiler still kicks in over night ?

Thanks for any help.