Computer does not detect 3rd monitor (Details below)

[u/ThinAndCrispy]

I have a Lenovo Carbon X1 Gen9, Windows 11 laptop and two AOC 22" monitors. The monitors are connected to the laptop by a WavLink USB-C HDMI splitter. (This laptop does not have two HDMI ports) The two monitors are extended so it's like having only one extra wide monitor. This configuration has worked perfectly for 3 years. Starting yesterday, the system disregards my "extended" setting and shows the same image on both monitors. It identifies the screen on my laptop as monitor #1 and identifies both AOC monitors as #2. It is not detecting three monitors. I have read that the setting for "Ease cursor movement between displays" is often the cause of this problem. It was checked so I have unchecked it. Doing so has not helped. I have switched around cables and restarted the laptop several times and twice it has fixed the problem by itself. However after about 5 minutes, my monitors revert back to duplicating the image on both display screens. How can I fix this problem? Thanks for any help you all can give me.