My Samsung s20Fe does not like smart connecting to the 5ghz band even when right next to the Deco x20 router. Specifically if it is connected to the 5ghz, then I walk far away it switches to the 2.4ghz automatically (smart connect). Now if I walk back to the router it refuses to connect back to the 5ghz network.

My old xiaomi phone has no problems. I read somewhere that samsung likes to connect to 5ghz when the band is set to 156mhz or something. Unfortunately you cannot change the band on the deco.... So I cannot test this. 

Is there any fix?