Read this if you can't mine ETH with PhoenixMiner: important message for everyone that is running older versions of PhoenixMiner (before 4.2) - this was already posted here a few times:

IMPORTANT! The versions of PhoenixMiner before 4.2 only support DAG epoch up to 265. ETH has reached epoch 266 already. To ensure uninterrupted operation, please upgrade to 4.2. If you are mining other coins, you can safely disregard this message.

The reason for this limitation is that we need to perform some quite complex calculations for each future DAG epoch in order to increase the hashrate of the optimized kernels. Recently we have added more computational resources and PhoenixMiner 4.2 will work without problems up to DAG epoch 329. We will increase this number significantly (e.g. 400 or more) in the next version.

To answer other questions:

1. Yes, we are working on the next version. There aren't any huge changes however, so we are taking our time to fix any problems, add small missing features, etc. We will probably release the next version shortly after the new AMD 5700 cards are released (they should be out on Jul 7th).
2. You should not upgrade the AMD drivers or let Windows 10 upgrade itself because all current AMD cards are released a long time ago (Radeon VII is the only exception) and there is no upside in upgrading the driver, only downsides (like AMD constantly changing the API for clocks, fans, voltages control, etc.).