I had no problems entering and leaving the nether at first. Then I started linking my Nether portals and when they were finally linked, I left the Nether without issue.

But then when I want te re-enter the Nether through the linked portal, the game freezes when loading the Nether. When I restart the game and my save, it drops me in the Nether just after the point it froze, so that means it did save. Now when I want to leave the Nether it's no problem just whenever I enter the Nether it keeps on freezing. This problem only started to occur when portals were linked.

I got mad etc thinking my save was broken so I deleted it and started a new one but in this save I got the same problem.