Have the trails seen a significant increase in traffic? I guess it is enevitible with more riders there will always be a proportion who mince about on the brakes, it tends to be a few riders coming in a bit heavy on the brakes causing that first ripple, which in turn forms a puddle, and the next time they approach their braking point shifts a foot back (now they are approaching a puddle/ripple before a corner) thus starting the creation of another ripple/bump….
I suppose you could argue that suspension has the knock on effect of allowing a poor rider to get to higher speeds than they would manage on a HT and then of course as they are braking too late/sharply from a higher speed they will displace more material and skid about causing more damage each time, so I guess bounce could be at least partly blamed, but in general an increase in traffic brings these trail wear problems out more…
Not knowing the details of the trail, is there any way you could make a feature out of the damaged section? A small kicker or exaggerate the ripples into a pump section to try and modify riders behaviour?
Would a trail repair accompanied by improved drainage help the issue or would it just be a sticking plaster solution?