Genie receiver won't change channels all the time. Also sometimes will not turn on f

From remote, can't always change channel & sometimes(frequently) tv will not turn on with remote. Have to retry several times to turn on. Channels very often will not come in when changing from one to another. Seems to happen most frequently on ch 362 & 360, but occurs on all channels at time. Have tried all resets, unplugging & replugging, testing cables secure, replace remote batteries, etc. Set plugged directly into wall outlet. Have tried all suggestions from Direct tv support. What next other than replace reciever?