Help 14 month old has tantrums for no apparent reason!?

Hey all, my son has recently turned 14 months, and with that tantrums have come. I know the best way to deal with it is ignore it. My problem is I have no idea what is setting them off. We do say no and redirect him if he is say, pulling on a power cord or going for the cat's tail. He does fine with that. My concern is the tantrums are coming out of left field. For instance, I'll be holding him, he'll start freaking out, so I will out him down and then he will climb my leg and melt down even more. He also seems to save the tantrums for me in particular, he is happy and playful at daycare- he is going through a phase of intense separation anxiety, he is fine when he goes to daycare but will lose it if I leave his range of vision any other time, even when dad is around. I know this is normal, do you think it plays into the tantrums somehow? I spend every waking moment when he isn't at daycare playing with/interacting with him. He has had meltdowns in the past if he was tired, but these are new. I don't want to make him feel unloved or reinforce this behavior. And I have researched online, I am looking for personal experiences. I posted this in the suggested area, toddler and got one response-a person asked if I watched tv or did housework while he is home with me-the answer is no, I play with him the whole time. Thank You.