how can I fix my oster otm1101gbs starting problem?

my oster otm1101gbs is working fine except for one problem. After turning the time knob for cook time,the start button needs to be pressed multiple times for the cooking to start. Sometimes it may be 3 times and the other times it might be 10 times. could you please tell me if this is a fixable problem?.
If it is fixable can you tell me if I can do it myself?.
Thank you