Hi stevee
£90 is not bad to just move a mouse and click on format it’s very technical wonder how much he would charge to get some tools out
£200 to fit a hard drive …. 5 mins work…. There is no programming just two wire connections
but less than £200 you can have a new dvr with the ability to change your cameras overtime to 4K so gives you another 5 to 10 years
but first if you have a Philips screw driver I will send you a hard drive for free for your pioneer
take top cover off then turn unit over and you will see 4 screws holding hard drive in … unplug the two wires and insert new one
then see if you have the same problems
does that sound like a plan