matchboxbananasynergy Heya, matchbox, unfortunately I'm also experiencing this (lower case sentences, no spellcheck, etc.) and dropped in tonight to see if I was alone.
I have three keyboards installed; the default, Gboard, and KeepassDX's magikeyboard. I always keep the default disabled and magikeyboard lacks the usual qwerty keys.
Upon encountering these input issues after the last two updates, I noticed the default keyboard is re-enabled in Settings. Despite this, when I access the input method menu (keyboard icon at lower right of keyboard), Gboard is still showing as the current keyboard in use. Manually selecting it again resolves the issue temporarily.
Gboard itself was also updated at least once last month, so it may very well be coincidental to the GOS updates.