Being a part time (pension booster) driver, always doing agency work, I get into a lot of trucks of varying quality.
I’ve notice recently some have a tendency for the gear change to lock up in neutral especially after some quick changes. Is this something do to with using up a lot of air?
Mercedes seem more prone to the problem.
Just curious 
Ive found mercs a problem too, their trucks are just all round ■■■■, espcially the Back-Sore-Axor!!! 
I had a Merc once that needed all those pipes above the bellhousing replacing on the gearbox, thing was stuck in 3rd so i limped it down to the garage, but yes, you cannot hurry changes on them, they’re soft as ■■■■■
I get this on the Dafs we drive. Flicking the range change once or twice sorts it but I have wondered about this myself. Crap drivers…? 