check your selespeed oil level.
if you're pressure drops, reverse is the first that starts to struggle.
If you do not have a diagnostics yet, fill the selespeed, then start the car 5 times, each time you'll hear 2 knocks from the gearbox, directly after start, you have to switch it off then.. after 5 times you'll have blead the system and the gears should feel fine including reverse selection.
if you're pressure drops, reverse is the first that starts to struggle.
If you do not have a diagnostics yet, fill the selespeed, then start the car 5 times, each time you'll hear 2 knocks from the gearbox, directly after start, you have to switch it off then.. after 5 times you'll have blead the system and the gears should feel fine including reverse selection.