Have you checked your fluid level? You may be a bit on the low side.
From what you described, it sounds like a low fluid condition. If the fluid level is starting to get low, there may be a drop in line pressure due to the engine/trans being cold which goes away once everything reaches normal operating temperature.
I agree with DEP50 too - a fluid flush could help too (and would also restore the fluid to its proper level).
Dave
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