I had to look up your public profile to see you have a 2004.
Please include year, engine specifics, trim level (sometimes) and other pertinent info. It helps.
You're '04 is in the era of the weak DIM (Drivers' Information Module).
In all likelihood the "big momma" processor on your instrument cluster (aka DIM) has a few cracked / failing solder joints.
Hot weather is linked to the symptom.
There are shops you send your DIM to (easy to remove) for reflowing of said joints.
Several have said that these 'cold joints' are doable at home. I looked at mine and ran away like a scalded dog. I wasn't going to practice on the one and only cluster I had.
Do what you like. The UK guy who repairs them is regarded highly on this board.
Someone will be along with the fellow's contact info.
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