Hi there, We did some more research for you and found an answer for you. The light is being controlled by “noise” likely. This happens depending upon how common your fan is, e.g someone nearby having a same / similar fan or even using similar IR frequencies.
Watch the video on this page, the gentleman in the video replaces his remote and receiver for a very similar reason you described. He said the fan light is flicking, and also sometimes comes on by itself without him turning it on. He goes on to say how noise from other remotes nearby is causing the problem. check it out and let us know if that helps.