Haven’t used Deepin in Arch for a while, but general advice for this DE:
Keep an eye on their bug-tracker (with Deepin it’s always very good idea)
If there are no issues related to yours, create one titled: [Arch] Title
And mention @felixonmars if you need help urgent, as he’s maintainer of Deepin’s arch packages and most likely will give you fastest help at hand and push some upstream fixes…