Three times in the last year I've had the nut on my steering drop arm tightened, three times the drop arm has worked loose....... Billy at Lix Toll diagnosed the problem on Weds while doing they were my MOT - Wrong Drop Arm. Evidently my vehicle had the drop arm for a 6 bolt steering box as opposed to its 4 bolt one - they look identical to the casual view but the splines are different.
...and came into work today to read an Army report on a WOLF that had the drop arm come off altogether due to the lock-tab being done up incorrectly. Another batch of MOD vehicles were found to have incorrect lock-tabs fitted - not wide enough to actually do the job properly.
Sloppy steering ? Try checking the tighness of the drop-arm. There should be no vertical movement.