I've had some problems with our Roku Expresses freezing and stuttering on YouTube TV (particularly in commercials for whatever reason). The Roku Express is a stand alone unit that has a USB cord for power - I found that instead of plugging it into the TV's, if you use a phone charger style wall wart, it seems a lot more stable. I suspect the TV is not able to provide as much juice via USB as the wall wart.
7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic UB420, Apple TV 4K, JBL Studio 530’s, Dual Driver VBSS
3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne, Roku Express (2019)