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When I lock the door with the door button as soon as i get out and close the door the trunk opens, reclose the trunk and reopen again. The car battery is new from this spring. Never had issues before but started to to this since 2 weeks.
Best guess....truck release button on FOB or dash is sticking or trunk release on FOB is accidentally pressed while in your pockets (maybe against another set of keys).
(Does the trunk open normally using the dash or FOB buttons?)
Second guess...low battery in FOB.
You may wish to experiment with auto unlock and lock setup in the DIC setup (see you owners manual) to make sure other systems are functioning properly.