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I suspect some electric/electronic interference.

Install the FV-30BB non amplified antenna outside and above the roof.

Aim the antenna to the North West.

Connect a New Continues Length of coax to the antenna and run the coax through a open door or window , direct to 1 Tv.

Is the 4 second interference happening now??

If so , then go to the circuit breaker panel and shut off electric with the circuit breakers to sections of the house except for the room the Tv is in.

And in the room the Tv is in and the other rooms that circuit breaker provides power to , unplug All devices.

Is the interference happening now??

And in an effort to find the source of interference if it is on the property some where.

People have even bought a portable battery powered Tv , and switched off the Main Circuit Breakers for the house and other buildings on the property.

And if no battery powered Tv , then have run a long extinion cord from the neighbors house to power the Tv.

Or rented a portable generator to power the Tv.

And the FV-30BB antenna can be used to locate interference on and around the property or even off the property .

Install the FV-30BB antenna on a broom handle connect a long coax and use the FV-30BB antenna as a probe.

Usually a electric/electronic device is generating the interference some where in the the house in the attic or outside the house.

Often it is a power supply transformer and or device that is plugged in all the time and has gone bad.

At my wife sister house , a Old Caller ID Device that was plugged in years ago , buried under a pile of stuff and forgot about was found and unplugged and the interference stopped.

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If something is causing interference inside/outside the house it can be Anywhere and can be Anything.