My urine pH shoots up to 9.0 at random times then goes back to norm! Why is this? No infection. Everything else norm. Bun & creat. Are also norm.

Hard to explain. Sounds like you are doing some testing on yourself. Could be "lab error" or possibly hyperventilation, but i expect you would have to hyperventilate pretty well for a good period of time to see a substantial change. Anything els that could produce this would either be obvious or not so transient.