House type: Landed
Size of house: Around 4000 sqft, double story
Features required: Router that can work with Maxis Fibre, Wifi 6 preferred
Number of devices connected to WiFi: 20+
Internet Speed: 500 Mbps
Budget: ~RM500, but flexible

Hi, would like to seek your advice for a new router. Just changed to Maxis Fibre 500 Mbps package, and was provided with the KAONMEDIA AR2140 and a Deco M4R (2-pack). The KAON router worked very well with almost no downtime at all, but failed after a month or so. Got the Maxis technician to come and they replaced it with a Huawei LG8245X6. The Huawei router doesn't seem able to support the amount of devices, with packet loss and lag spikes for 2-3 minutes every hour or so.

Don't need super wide coverage, as it will be covered by the Deco M4, just need a stable router that can handle the large amount of devices.
The budget of RM500 is flexible and can top up if worth it. Thanks in advance for any suggestions!