HDMi signal drops outs with heavy load devices turning on or off

[SCIVIRUS]

my church have multiple projectors .its input are Short HDMI cables to a splitter to a single input source also short its then goes to a cat6 converter 20 meters cable to another convertor hdmi into a AV controlled. but any time any device with a heavy load goes on or off the image will drops for a few seconds what can be the cause and how can i prevent it

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