Cable box will drop out channel video and audio now and again while streaming via Amazon Fire seems fine.

Cable box will drop out video and audio now and again while streaming, via Amazon Fire, seems fine. Have replaced only signal splitter with amplified version. Using modem, all signal strengths and SNR seem fine but cable channels still drop out now and again .Sometimes channel drop out is for minutes, other times, just for seconds. All cable connections from Cox underground cable junction at street to powered splitter are tight. To me, this all started after a close by lightening strike several months ago which did get into my receiver and TV. Do not understand Cox cable but appears cable carries multiple frequencies which carry actual digital video and audio. Could some active component in the Cox system for my street have one or more frequencies bad?? How to fix this. Oh, did replace Cox cable box a month ago before amplified splitter and same problem.  Help