I don't want to make things even worse for you (Osram bulbs are widely noted as being on the "naughty list"), but are these Cree bulbs directly paired to Hubitat? If so, you might run into problems with those too (they're also on many people's list). The "Tips..." section of the Hubitat Zigbee docs summarize the issue with these bulbs and many others:
Avoid adding Zigbee lightbulbs to your hub in combination with other Zigbee devices, since the lightbulbs will try to act as [repeaters], but unfortunately they only perform this role properly with other lightbulbs. The exception we have found are Sengled Zigbee lightbulbs, which do not try to take on the role of repeating other Zigbee devices. Zigbee light bulbs do not have issues routing among themselves, therefore a good alternative is a separate Zigbee network via a compatible bridge such as the Philips Hub Bridge, or a second Hubitat Elevation hub with only Zigbee lightbulbs paired to it. This will avoid this issue of bulbs attempting, and subsequently failing to repeat signals for other devices, by establishing two separate and stable Zigbee networks.
If your Cree bulbs are already on a Hue Bridge or if you don't have any non-bulb Zigbee devices (like smart plugs, motion sensors, etc.) on the same network, then you're unlikely to notice these problems. Personally, I had problems even on a bulb-only hub with the Crees--they kept "falling off" like you describe with the Osram (a problem I also noticed with the only Osram bulb I ever used, but then on SmartThings; I eventually got rid of it). Your luck may vary, and it seems maybe it's actually good here. 
(They work great on a Hue Bridge, BTW--that's where I moved all my Cree bulbs back to after the aforementioned experiment. That's not an option for Osram unless you're lucky enough to have one with Zigbee Light Link/ZLL firmware, something they foolishly stopped offering to US customers a while back.)
