Support Micromax a25 duplicate msg problem

Hi guys.... I've been using MMX A25 for 8 months now and all was fine....

But recently for almost a couple of weeks now i've been receiving duplicate msgs sometimes even 10 times... I'm also not receiving msgs on time.... I checked with my service provider and they're saying there's no issues on their side....

I tried my SIM on a different phone and the issue was not there....

On doing a google search I found that lots of android users are facing this problem and one of the recommendations is to flash the phone...

Is any one else facing this prob??? Can you pls suggest wat to do....

If i must flash the phone can someone pls provide the instructions???

BTW My phone is rooted....