i have a little giant that is a few years old. I cant seem to keep the temp at 99.5 degrees. it ranges from 97.8- 102.1 degrees. i havent touched the temp knob because it spikes the temp too high or too low. it this a problem or not . what do i need to do. the humidity is also a ?. what is a good number for humidity? i read all different #s for day 1 to day 18. i am on day 14 now. please help.