Audio lag/echo problem with app

I’ve been using my dejay2 app for years. I took it to another level and bought the DDJ WEGO4 and loved it. But after months of using it without any problems it starting having an echo effect and/or audio lag as I put a song on one of the turntables. I called the website where I bought it from thinking that was the problem but when I try to use the app without the WEGO4, the problem didn’t go away. Please advise!