Volvo S40 air conditioner

Good morning:
I have a Volvo S 40 of the year 2005 of gasoline 140 hp and 2.4 cc.
It happens that when the outside temperature is approximately 33 degrees or more the air conditioner stops cooling, disconnected and after a couple of minutes I connect it and cool again for 10 minutes, until it stops cooling again, I do the same operation again and start cooling again.
With a temperature below 33 degrees, nothing happens without problems.
I have taken it to two air conditioning workshops (not to Volvo service) and they find nothing.
They could help me.
Thank you so much.

Check the electrical part with warming, that is, relay, etc. It seems that there is an envelope in the compressor and the air conditioner sends to stop,
the compressor is due to variable embolajados or on-off system