Your Brother may only need to be serviced. I have a cheapie Brother from WalMart.. bought it 3 years ago. It is not computerized. I started having tension trouble with it about a year after I got it. To it to my local sewing machine repair person and he cleaned and serviced it. I have had no problems since.. BUT I also learned to clean the bobbin area myself regularly and I only use 100% cotton thread. Barb C