Trouble with Samsung tv

Not sure where to ask this question. I have 3 tv’s. All have Firesticks. My problem is that my very old Phillips tv and my older Sony both play my IPTV service very well. The new Samsung 4k with the 4kMax Firestick has a lot of buffering. I have switched the Firesticks around and have the same problem. The Samsung will also change the source and I have to go into the settings and change it back to the Firestick. Is there some settings I need to change on the switch tv? Any ideas would be appreciated. Thank you.

Turn off your smart function on the TV.

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