A customer had a KSR L.E.D. batten fitting fail within a year. I looked inside the driver and it is filled to capacity with electronic components. There is just so much that can fail. There is nothing black or blown up, so the fault must be a failed or intermittently faulty component.
The replacement was one of these…

But there is not room inside for terminating cables. The unit comes with a half metre long pre-installed flex and three ceiling fixings. It is fiddly to install and a bit of a pain. The flex has to run inside a channel or the fitting will not sit tight against a ceiling. Very bright though. Avoid.
Z.