Is my receiving address supposed to change, and if so, how often does it do so?
The one that got pasted to my clipboard is different than the one I used a few weeks ago. I made sure it’s the same wallet.
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And further to the above, what happens if I use an old address even though the wallet tells me to use a different one?
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Hii @Steamdude
The question in matter have a simple answer.
PRIVACY.
Using the same address Significantly reduces the privacy of your wallet
In a transaction, the spender and receiver each reveal to each other all public keys or addresses used in that transaction. This allows either person to use the public blockchain to track past and future transactions involving the other person’s same addresses
Check this trezor wiki
https://wiki.trezor.io/Address_reuse
Because of privacy everytime you use one address on the next transaction you will get a new address so you don’t have to use the old.
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For alcoins supported by Trezor wallets is the only way to get a new receiving address to create a new account in Trezor suite? For example, if I don’t want to reuse existing SOL address to receive funds, I must create a new SOL account? Correct?
Hi @blablabla , Yes, that’s correct. 
For Bitcoin and other UTXO-based cryptocurrencies (such as Litecoin, Dogecoin, and Zcash), Trezor Suite automatically generates a new receiving address after each transaction. This is a privacy feature that makes it more difficult for others to link your transactions together. All previously generated receiving addresses remain valid and can still be used to receive funds.
Solana works differently. Each Solana account has a single receiving address, which does not change over time. If you would like to have a different Solana receiving address, you will need to create a new Solana account in Trezor Suite. Each account has its own unique address and can be managed independently.