In general 5ghz isn’t great for stability. Unless you’re in the same room and have a clear los to the router, then 5ghz waves can struggle to reach you.

As 5ghz waves are wider than 2.4 they are also less penetrative - they can struggle to get through walls, furniture and sometimes even people.

2.4ghz can support up to around 140mbps, so just using 2.4 is generally the better option for portability.