On my Asus X301A I have only Elementary OS Freya installed. Everything was great but at some point of time it started to boot to Aptio Setup Utility which is UEFI on my laptop, as far as I understand. So it boots there almost all the time, but sometimes I reload and it boots normally to elementary OS.
I tried Boot-Repair tool several times, after one 'repair' it seemed that it was finally fixed, as laptop booted normally for some time, but then I installed some updates and it started again...
Here is one of my boot-info summaries: http://paste2.org/m52Mt48U
Many thanks in advance!!