I’ve had 6 LiFX BR30 lights on the front of my house since 2019. At first, they were pretty decent. One would fall off the network every other month, or so, but that wasn’t much of a pain. Lately, multiple lights will drop off the Wi-Fi every week. I’m at the point where I will either replace them, or install smart switches to just turn them off/on like normal lights. Looking around, I don’t see much in this size that are rated for outdoor use and support multiple colors. The current ones are set to Ukraine colors since the invasion, and I also change them for holidays. Ideally, I’d like to find something supporting zigbee, thread, or z-wave - pretty much in that order.
I have some hue light (ZigBee) for some years and they are rock solid but pricey. That being said, another possibility for your issue could be wifi interference, you could try to analyse and change wifi Channel on your router to see if it gets better.
I’ve looked at Hue, but didn’t see any outdoor rated flood lights in their line up. Perhaps I’m just blind.
I have looked at the wi-fi. They’re locked to 2.4 GHz, but I can’t change the channel on the Deco mesh that I have. It scans the network and selects what it thinks is the best. According to my signal scanner, it’s not in the best channel, but it’s not in the worst, either. Plus, the same scanner says the lights should be getting an excellent signal where they are in relation to the AP.
Mines are not outdoor rated, they are just bulb behind (don’t know the word in English) https://duckduckgo.com/?q=applique+extérieure+lumière+&t=fpas&iax=images&ia=images
Here is one outside rated (but should have more available) https://www.bestbuy.com/site/philips-hue-white-welcome-outdoor-floodlight-black/6326654.p?skuId=6326654&intl=nosplash
It is normal behaviour to have them locked to 2.4ghz (just like any other wifi smart things). And it is better that way as 2.4ghz has a longer wifi range than 5ghz.