[doverden]

On my 2005 Open, with twin D6-310 Volvos, I am currently experiencing a problem with reverse gear on the port side transmission, but only after boat has been underway or reached normal operating temperatures for 20 minutes or more.  At this point transmission pressure is normal when in neutral, but as soon as I shift to reverse, pressure drops and also RPMs drop to the point of stalling the engine, and I have no power in reverse on the Port engine. Reverse mode is fine when boat is first started and not yet at temperature.  Thought maybe there was a crab trap line caught in the prop but checked this and can find nothing or anything affecting the port screw and prop. (In my introduction post I mentioned the boat floated off my boat lift during hurricane Mathew..wanted to point out this problem with reverse surfaced before the hurricane so there is no possible cause from that.)
Any suggestions please?