Mazda 3 2015 Brakes

[Weezywee]

Hoping for some advice. Had the front pads and discs done in Jan and just had rears done too. Now Ive developed an almighty squeel if the brakes get hot and it appears if I turn the wheel ever so slightly, but also if braking. When its cold it seems to be fine, whoch makes me think its warping? Either way Im pretty miffed as they were main stealer parts! Has anybody experienced similar?