My SDV8 AB 2014 has developed a problem when reversing up very steep slopes . It stops responding to the throttle and comes to a halt Then after pressing the brake starts off normally then comes to a halt again. It's almost as if the EPB is coming on but the strange thing is it stops responding to the throttle at the same time. Has anyone got any ideas.

Check that one or both rear calipers are not getting hot ? they are known for sticking .
Mike G reg 2.5VM Vogue Portofino red 1991- 1999
V reg 2.5td P38 Rioja red 1999- 2006
53 reg td6 Vogue Oslo blue 2006- 2015
11 reg 4.4 TdV8 Vogue SE. Baltic blue 2015- date.
https://www.fullfatrr.com/forum/topic56162...tty+affair

I will but the weird thing is the lack of response to the throttle you can press way down with no response when it happens

Have you tried reversing up the hill in off road mode ie Mud ruts? 2018 SE SDV8 4.4 Byron Blue