After latest update to my SharpTV on 27th April (version V1.13.18.0_U002, compilation PTO8.200426.001) my brightness started randomly switching while watching shows or movies. On static pages (like main menu) it's ok, but during a movie even in one scene it can jump from dim to bright or from dark colors to lighter. I turned off all video options like denioser, HDR, auto quality, etc. but it doesn't help.
Do you know what can I do have you had similar issue? Unplugging even for whole night didn't resolve this.
Same issue, Same TV! Hopefully another update soon!