the vibrate setting on my t-mobile dash isnt workingggg!!!?

i have a tmobile dash phone, and the other day it was working fine, and then all the sudden it just stopped vibrating when id get texts or calls. i checked the phone settings and they were on vibrate. i switched to normal to see if that was working, and it worked fine. then i switched it back to vibrate and the vibrate STILL wasnt working. i have restarted it and taken the battery out and all that stuff but its stilll nottt workinggg!! D: this has happened only once before but it has only lasted a day and then it just went back to normal. its super annoying. someone pleeeeeeease help meee! thankyou.
 
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