I don't believe it is the X60.

Here is why:

I had 2 x A53 Samsung's that both will not stay connect to a TP-Link Mesh network (X60 Deco). They will connect to other networks but not the Deco X60.

I have ditched one A53 and have one left and after all this time it has been connect my Telstra network but not the Mesh network.

Finally, did a bit of testing without any success until I put the A53 right next to the main DECO X60. That way it did not have to switch to any other X60 nodes.

It stayed connect and was able to upload the LAN. It has now uploaded more than half of my 1153 files without a problem. Previously it was impossible to upload more than a couple of files without disconnection.

Conclusion: I suggest that the A53 cannot handle the constant switching in the mesh network and drops the connection.

Samsung should either fix the problem or replace the A53 for anyone that has a Deco Mesh network, but of course.....

Hope this helps someone else.