The refilling on its own is because it's leaking. Most common place is the flapper valve (that's what opens to mske the toilet flush). It stops sealing properly and leaks into the bowl and the drain so occasionally the tank needs to refill itself. They're super easy to change. The wax ring isn't likely the issue. You can also check the bolts that hold the tank to the toilet. They pass through from the inside of the tank and are sealed with a rubber gasket that can sometimes leak if the tank gets moved slightly. See if there's water dripping from the ends of the bolts. If so, give the tank a gentle rock. The tank shouldn't be able to move at all so you may need to snug them a bit. Often that's enough but the rubber gaskets may need replaced. Just remember if you get new ones not to over tighten. Just enough to firm up the tank and try to tighten them evenly so the force is directed vertically, not at an angle

Put a few drops of food coloring in the tank. If the bowl water develops color, the flapper seal is likely leaking. If colored water/stains appear on the outside of the toilet, hopefully they'll point towards the leak.

Most likely the flapper, but check whether the water level is at the top of the overflow tube. If the fill valve is leaking, that's what you'll see.

Your submission has been removed for one or more of the following reason(s):

• Your title does not adequately describe your project or your question.
• Your title is clickbait or inaccurate.
• Your title contains the words "xpost" in some form or another.
• Your title is in ALL CAPITAL LETTERS.
• Your title is unreadable, not understandable, uses acronyms, is not in English, or is otherwise difficult to read.

Please read our Full Sub Rules before resubmitting

If you believe this was a mistake, please message the moderators.

###Do not respond to this comment - you will not receive a response.

Your submission has been removed for one or more of the following reason(s):

• Your question does not include the research you've done to find an answer yourself, or why that research didn't answer your question.

This is a basic requirement so others do not spend time repeating your steps. It is not a judgement about your question being "too easy." We're looking for evidence that you've made an attempt yourself.

• Please do not use /r/DIY as your first stop for questions - we are not Google.

• Please search Google and /r/DIY to see if your question has been asked before. Check owners manuals, tech support forums or contact the manufacturer.

• Have you already done some basic research and are still stuck?

• Please include what research you have done in your question so that others do not repeat your steps.

• Consider posting your question in the sticky thread at the top of the subreddit.

• Ask your question in our Discord server in the appropriate channel.

Please read our Full Sub Rules before resubmitting.

If you believe this was a mistake, please message the moderators.

###Do not respond to this comment - you will not receive a response.

I did do basic research...the results were ambiguous that's why I'm asking.