TV looses WIFI connection several times a day

We have Firesticks for TV and the living room Tv is connected with ethernet but kitchen TV is not.  A couple of weeks ago we had a power outage, some neighbors lost all internet, and then a couple days later we lost internet for a period.  My son next door had to get a new modem and had to have Comcast  out.  We have no problem with computers with ethernet, but kitchen TV looses the internet connection sometimes twice an hour.  The TV with the ethernet will pause now  then, but if I hit fast forward it will usually start ok.  I bought new 4k Firesticks.  The kitchen has an older HDML TV, is it the internet or the TV?