Recently (after about a year of use), the plastic light mounts perished and almost allowed the aquarium light to drop into the tank - but this is the only real trouble I have experienced with my JEBO R338 aquarium.
At the same time I noticed for the first time that one of the bulbs had blown, but replacement was very straight forward.
I "repaired" the problem by making 4 holes in the grey plastic sides of the light chamber and using cable ties to hold the light in place. It's a good idea to cover the globe contacts with insulation tape before you replace the plastic cover.
The plastic light mounts must have worn and become brittle as a result of heat from the light. It's probably not a good idea to put anything on top of your JEBO that will limit ventilation as this could contribute to weakening of the light mounts. I will also have to watch that the cable ties do not become brittle and break.