This issue seems to be in a lot of samsung phones, although i guess its due to the software bugs rather because i never faced this problem in my ACE, the only similar bug i got was that at times the softkeys light up and at times they won't turn off even when i locked the phone, but a reboot always solved that.
I haven't experienced any of this since i switched to custom roms.
Samsung GT-S5830 Galaxy Ace
ROM: AOKP 4.2.2
Scripts: CronMod INT2EXT4+
245MHz - 800MHz, SmartassH3