Watching a program Tv freezes the picture then goes black and then turns off then a bit later it pops back on ,

My Husband and I have been dealing with this since April we have had multiple boxes , can't get a hold of anyone. hate , hate, hate this company. the new box works for awhile but doesn't last long. and for the amount we pay its not worth it .I am sending a letter to corporate.if I was tech savvy it would be different , maybe but being 74 can't figure it out . help./