Sometimes can't connect to Netgear Nighthawk AC1900 Desktop WiFi Range Extender (EX7000-100NAS; AC1900).

Sometimes iPhones (6+ and 11 Pro Max) can't connect to Netgear Nighthawk 
AC1900 Desktop WiFi Range Extender (EX7000-100NAS; AC1900). They use the 
same wireless SSIDs (2.4Ghz and 5Ghz) from the old Netgear R6300 v1.0 
router. They tend to lose wifi connections when moving around far away 
from the router or coming back close to the router. I *think* they're 
confused even their though signal strengths are strong like standing 
right next to it. Sometimes disabling and re-enabling iPhones' wifi 
fixes it. Rebooting the extender usually fixes it. Everything have the 
(lat/new)est stock official updates.

What's wrong? Thank you for reading and hopefully answering soon. :)
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