Hello Gaijin2swim - thank you for reporting these issues and for including an english translation with your post. I will address each item in turn here:
Interaction Issue
- In case you haven’t seen it, I have been updating the post on this issue here - [Known Issue][PS4/XB1] Loss of interactions - and includeds links to posts from the developers and some extra workarounds that have worked for players.
FPS
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Are you playing on a new save or is this an older established save that was updated from version 2033 to 2071?
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In the past players have reported storing items in crates, especially if they have a lot of loose items on their island, which has helped to ease the FPS Drop.
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I do have a report for the team on this and will update it with any extra information about you save and setup you can provide.
Items disappearing
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Can you elaborate on the items disappearing? Are there any items in particular this occurs with?
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When this happens are you playing Single Player and Multiplayer? If you’re playing multiplayer are you the host or Player 2?
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Some players have mentioned the items turn invisible but they can still find them, or they find them later on reload or near the shore, has this occurred in your save at all?
Audio
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When the cooking noises follow you, have you set items to cook before leaving? What method are you using to cook these items?
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When you hear sizzling, are items actively being cooked at the time or does this appear to happen randomly?
Any extra information about your experiences of these issues that you can provide would be greatly appreciated as it can help the team to investigate these issues further. Thank you.