Phal with one flower shriveling - behind a new bud

[ClassyK]

One of my phals has been in full bloom since Jan 1st (duel spike). Around Feb 1st it shot out and extra bud on one side and two on the other. The side with 1 fully opened no problem, the side with 2 one opened and I have one bud. Today I noticed the flower behind my bud shriveled, the bud looks fine and all my other flowers do as well (pics attached).

I'm a little concerned, I bought this one 2 winters ago with the flowers off but spikes still in tact, they didn't die off and I kept them. Last year it shot of shoots on the old spikes, maybe 3 flowers each. It then shot out a 3rd spike and I had a few more flowers on that. When that 3rd spike shot though it was followed by a root die off (I house them in clear pots to see). And I lost a few flowers.

My roots are looking good but I'm now nervous about what the shriveling flower means and if I might have a root die off again. Leaves look good, nothing else is visually concerning. I had a second phal form a new bud this last week, a month after fully blooming as well. All 5 of mine have been happy where they are, but this guy has thrown me for a loop for the second year and I'm curious on if has any ideas on what is going on with this guy.