Bottom runner come away on sliding door

[Glocko]

Hi chaps.
First post here!
I've borrowed a 2005 LWB Transit minibus for the weekend.
Yesterday I couldn't close the sliding side door (nearside)
It transpires that the bottom runner mechanism has come away from the groove it's supposed to run along.
Is this a simple fix? Will something (nut etc) have come away to cause this?
Will post pics if necessary.
Thanks
Paul

[ake]

Its usually the roller which fails allowing the door to come adrift

[earthman]

I've experienced this on the vans at work, only 3/4 years old, I can't see any thing wrong with the rollers though. I just pop it back into place and often it works for weeks/months OK until the next time.

[trigger]

That used to happen on my old LDV council van, it was only about a year old as well