Z Fold 5 Dex mode

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Hi,
I'm having a problem with Dex mode. I've had Z fold 5 for about a month. At first there was no problem when using Dex mode to connect to the Galaxy Tab S9 FE, but now when I try to go into Dex mode and connect to the tablet as a screen, it doesn't connect. Please do you have any idea what could be causing this? For example, the two devices recognize each other in Samsung Flow and work together, but when I start DeX it finds my tablet but doesn't connect.