I'm 5 week's into flowering and the big fan leaves are dropping off some are yellowish some are a liitle dry is this normal. Losing around 5-10 leafs a plant (last 7-10days) though the leaf around the bud is sweet. Height not changed for a week but bud is growing very strong.
Yes, that is normal. And your pics looks awesome. Older fan leaves typically start to turn yellow and fall off later in flowering. It’s a sign you’re getting closer to harvest.
Without pictures I can only guess. If the leaves were lower on the plant under the main canopy then some yellowing of the fan leaves would be normal. If they were higher up on the plant it could’ve a sign of some sort hf stress