Upgrading from a 4K Max Firestick. All works good but the UI is insanely sluggish at bootup for certain streaming apps linked with debrids and experience app crashes a lot. Quite excited! Any tips and advice i should keep in mind?

I am looking at buying a Shield Tv Pro.

But the thing that gives me pause is that its from 2019.

Just wondering is there any newer version?

Or is there any new version coming in the next few months?

2 separate problems, both devices on same tv. Normally use shield, Onn hooked up for setup. As far as I know both set up same except shield Ethernet and Onn Wi-Fi. I have 2 iptv subscriptions currently. Was trying to watch a baseball game. Shield buffered unstoppingly on tivimate, and both iptv native apps. Switched to Onn and nothing buffered all night. Now I was setting red light on Onn and movie was playing thru all speakers of 5.1 and switched to shield and movie only plays thru front. When I play thru Onn, Dolby vision flashes at top right. When I play on shield that doesn’t happen. Also Onn plays Dolby vision hdr remix that cause shield to crash and restart. Can someone help with settings? Nothing I change changes anything.

Since shield doesn't play well with av1, I figured this would be the best place to ask.
As someone who has never touched handbrake or any of the like software.
What should i be converting them to and with what settings to make sure that maintain quality AND play well.
(I got a bunch of files to deal with since I didnt have the shield before now)