Diesel Souds keep dissapearing

[F1RacerDan]

Hi guys fairly newb captain here!

Installed the GWX mod and a few little sound mods mostly the thompson 3.2

However the interior diesel sounds every so often go silent even tho im still going lol if i just to the bridge then back down they reappear for a short time? not sure what is wrong and wandered if anyone knew the issue lol I enjoy hearing that diesel ticking over as im looking at the map