This is a client decision. And there are countless parameters going into this. First is to look at the signal of the MR36 in the room and the signal from the other AP. Compare this to your Wireless design. Very likely, the roaming threshold is not crossed because the other AP is too "loud". If Wireless is important, let someone do a validation survey. Based on the OS, you can also reconfigure the roaming agressiviness on the client. But always only do one change at the time as things could easily get worse.
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