If you are "traveling" I'd set your Roku at the lowest resolution before you removed it from your "home base". You can always reset it higher, and a factory reset should be a last resort. It's a PITA to reset it ( I do it every day to watch on my second TV* while playing games on my first TV), but it is really the only way to do it.
*my second TV is only 720p, or 480i if used via DVD recorder while first TV is 1080p
Charter Spectrum 60; d-link dual band router
Roku 4210, 3710; Xbox One, 360; Samsung BD player
Samsung tablet; Windows Vista laptop; LG phone
Toshiba DVD-R; Sony AVR; Panasonic AR
1080p and 720p TVs