Filters shouldn't get warm unless it's under-rated.
Some filters are only for light duty 3-5amps, 5-7amps, some are 10-15amps and so on....
It may have been provided (more cost-cutting) on the basis that a standard machine won't draw more current than the capability of the filter, however since adding more lamps or higher current lamps, mods and general current consuming/inefficient 'wear' of certain components, the filter could now be crapping itself.
MM.
