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Possible splitter box issue on roof

Intermittent problem with tv channels dropping out (comes up with no signal). Most often it is just tv3 but last weekend all channels dropped out for a period of time (affected upstairs tv too). Has been happening intermittently for a couple of months. Had a similar problem in 2020 and from memory the repair person said the splitter box had been installed upside down and water was getting in. Two level townhouse. Need someone to take a look after 3:30pm during the week or at the weekend.