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Which build number do you have under Settings -> About phone? If you have Android 5.0 in your phone, do you know if it worked before the update?
Which Android version do you have in the phones that's working?
The reason i ask is that i have seen a few cases where some devices seems to not be fully compatible with Lollipop. In these cases Miracast stops working when you update the phone/tablet to Lollipop but installing the latest firmware for the TV/bluray/Miracast-receiver has helped in those cases.
Have you also tried to update the firmware in your bluray? From what i could find on Philips web page, the latest update (1.29.00) says it improves Android compatibility.
Miracast issues