TOUCH PAD gets hang on working

Presently I am on Ubuntu 11.10- Oneiric series, using it successfully since a month. My Laptop is Acer Aspire 5740 with core i5 processor. Since a week, i am facing serious problem with my touch pad. It gets hanged at times when i logged in to my desktop interface, when i open a site, when i get into my drives or folders. And sometimes it works very well for hours. I had never faced this problem earlier. With this problem, I have to directly press the power switch to put off my Laptop and start it again. Sometimes i have to carry out this shut down and power on for 3-4 times after which the cursor starts moving. Kindly help me with its solution. I am lucky to post this question as my touch pad is functioning now. But it wont sometimes.