Review Tool

I am constantly getting feedback from other team members when using the Review tool with various issues. things like latency, no voiceover coming through, blank screens, getting stuck and having to restart, etc. I do not experience any of these issues. Does anyone know of settings, or workarounds for this - is it computer specific to the end-user? Is it a browser issue, is there anything to recommend to them to get a better end-user experience while in the app? This is while using Storyline review content.