Gas fees can suddenly increase due to:
Network Congestion: More people are making transactions, filling up blocks, and causing a backlog.
High Demand: Popular events, like a token sale or a new project launch, can spike transaction demand.
Complex Transactions: Complex operations, like interacting with a DeFi protocol, can require more gas than simple transfers.
Gas Price Auctions: Users bid higher gas prices to get their transactions processed faster, driving up the average fee.
Remember, gas fees fluctuate based on supply (block space) and demand (transaction requests).