After putting liquidity into a farm 3 days ago, it's now had its yield cut in half today. Because of the size of my LP, the yield I've received over the last 3 days won't even cover the slippage I'll experience by withdrawing and the risk of impermanent loss is not worth the yield after it's been reduced in half.
I propose a warning a 3 days in advance to be displayed on any farm which is going to have its multiplier reduced, so that LP's know ahead of time whether its worth committing their liquidity to a given pool.