Webpages regularly failing to load

It appears there are a number of similar issues on this forum but they have all been archived so I cannot add to them. With some websites Firefox seems to work fine. Other websites in the middle of an otherwise functional browsing session will completely fail to load, with or without a frozen loading bar. This happens on an android tablet and phone, mostly for the same websites. Sometimes I can come back to the tab a few minutes later, refresh or tap the URL bar and hit enter and it'll work. Sometimes I can copy the URL to a new tab where it will load normally. Sometimes neither method works, in which case rebooting the phone fails to fix it as well!! On the tablet the reload button is visible on the menu bar, I found I can press and hold it which appears to do a different kind of refresh than just pressing it - I imagine akin to ctrl-f5 on Windows. This will sometimes work, but often not until a minute or two has elapsed. I'm on Firefox 131 and has persisted for months so if it's something that should have been fixed in updates, it definitely doesn't apply to what I'm experiencing. Please help! I am tired of having my browsing experience interrupted for multiple minutes or worse.