looking for a little help. Im working on a 10 ton trane hot gas reheat morginizer. When the unit starts suction pressure drops so low it opens the lps and the unit shuts off with in 5 second pressure goes back up and unit fires back up it will do this until compressor gets so hot it opens the overload. The liqiud line filter was freezeing on the evap side up to the txv so i changed both thinking i had a restriction no change. Charge is right on with the name plate i was wondering with the added coil on this unit could name plate be wrong and im under charged. suction line is warm at compressor head pressure is about 180 psi all fans are working.