[Q] Messaging sending too many texts topic

I have an Xperia S with latest FW 4.1.2, 6.2.B.1.96 and I have problem in sending a text to a group. Whenever I send texts to a group, a message pops up saying " Messaging is sending too many Text" and asks to allow or deny. I`m really offended by this problem. I googled this problem but i`ve been unfortunate to find a successful solution. I dont want to install any other messaging app. I dont know how to remove this limit. I would really be grateful if someone can help me solve this problem.I tried to find setting message limit in settings (both general settings and Messaging settings) but couldnt find anything.