Too many soft resets/reboots?

Can you have too many soft resets/reboots? I restarted my phone manually with the button about 15 or so times in an hour period because each time my LG Stylo 4 was taking very long to load. I was only able to access my apps once during the hour that my phone was continuously booting. Eventually, I got a message on my phone that read “TST (?) reboot mode” and displayed all of the general product information, as the phone make and model and hw version. I am not sure what TST means or if it even said TST because part of the letters was cut off by the phone screen. Any information helps!