Hello and welcome to the community. The problem you are currently experiencing is solvable, definitely, guaranteed. Even if you insist on using Brave browser alone and nothing else. However, in order for us to share with you the joy we are experiencing in using InfinityFree, you need to be specific on the pages (URLs) you are visiting. Then, kindly open the Console Panel from File → More tools → Developer tool, and share us the errors and warnings you see.
Since, enabling/disabling Shield, doesn’t offer any difference, kindly open up brave://settings/help , brave://settings/shields , brave://settings/shields/filters and custom filter lists (if any), so we can look a little bit deeper about Brave’s version and how does it filter content. Kindly inform (or screenshot) us those that are enabled and checked.
Also, it is perfectly possible that other factors like your ISP, router, anti-virus, company policy, and anything else might be the culprit in messing your experience. We are all ears to help and identify the source if you are willing to offer us a little bit of your time and patience. If you will abandon us soon then nothing else could be done.
Referencing posts outdated long ago doesn’t really say much about your current state. Brave updates frequently. There are also system upgrades here. We can’t be sure which/what happened/happening then/now. The same can be said why some people of interest chose to remain silent after posting their unfortunate experience. They moved on, yes, probably, but it doesn’t validate the issue was left unresolved, no help was offered, and nothing was done.