From these pictures does anyone know why 2 of my Foxtail Palms fell last night?

[Wstt]

I have now had 3 of 7 foxtail palms break and fall at the base. 2 fell last night in a storm. From the photos can anyone see what the problem might be?  First 2 pics are looking up at the trunk where the break was. 
are they wrottrn? Fungus? Disease? 

[aztropic]

Possibly planted too deep originally, or mulch piled on after planting built up too high against the trunk, suffocating the roots.

 

aztropic 

Mesa, Arizona 

[happypalms]

To wet! They got some sort of fungal disease from being to wet and as @aztropic suggests planted to deep! 

[quaman58]

Years ago I had a glorious triangle palm planted on the hillside. Over the years, mulch and soil piled up on one side and resulted in trunk rot which brought it down. But I never noticed since it was below the soil line. So I agree with the postings above.

[Harry’s Palms]

These are sensitive to wet feet ( overwatering) especially when they get bigger. I lost two , the only two I had , due to something else . When I removed the trunks they were not rotted as the ones in the pictures . I have really good drainage in my garden . The one pic shows that this has going on for a while , meaning maybe not enough drainage for the amount of water. Harry