42114 Volvo Truck keeps disconnecting from chassis

[Rusty43]

Good afternoon

I have recently completed the above model, all runs ok except that I am having trouble as the cabin keeps disconnecting from the chassis. I have attempted to modify this to no avail.

If anyone has had this problem or can give me solution It would be greatly appreciated 

Thanx 

Don R

[JunkstyleGio]

Some of us would like to see some pictures.