Intex Sand Filter timer wont turn on pump

I have had my filter pump for 2 years now and it has worked flawlessly, until now. I have the timer set to run for 4 hours. When it comes time to turn on it doesn't turn on. I have to manually put pressure on the switch to start running (note it is already in the timer switch position, I just have to add a little extra pressure to the switch). Not sure if it is the switch itself or some thing else going on. Any ideas? If it is the switch where can I get a replacement?