Keyboard fault - help!

i’ve not used my slim phatty for a couple of months, switched it on tonight and the first key responds when you hit it but the second key takes like 3-4 goes before a sound is played, i have reset it and its on version 3.1 , i can’t see any mode activated that would cause this, i am gutted if this is faulty already after selling a roland to finance this , is this a faulty keyboard?

any help much apreciated

Is the Auto Tune feature on? That can cause a slight delay between notes, even more of a delay if the synth is still warming up.