Reasons:
1. The circuit may get shorted with the increase in temperature.
2. You are giving more current or voltage than it should be.
3. Your fuse may be of lower quality as needed or defective or unsuitable fuse holder.
Could be several reasons including but not limited to bad power supply in the TV, the surge protector not doing it's job or bad ventilation where the tv is located causing it to overheat and blow the fuse. AS far as the power supply, could be a shorted regulator.
Because when the tv work in high voltage the fuse will blow. but due to the low voltage also the tv fuse will blow. hence the better solution for this problem is to keep the stabilizer.