Rooting itself doesn't cause that, so if it is related to root it's either due to something else you did or because the rooting tool messed something up. Did you change anything after rooting, or did this problem start straight away?
Not knowing what the cause is, the safest option, which will also unroot the phone, would be to reflash it with a new set of official software. Unfortunately I don't know this device at all, so don't know where to find the software or tools, so can't tell you how to do it for this phone, but that's what I'd research in this position.
If you have a custom recovery and took a backup of the ROM before the problem started you could restore that, but I'm guessing that's not the case.