In order to transition to PoS-only mode, the latest wallet update changed the staking rules.  The immediate effect is more transactions trying to stake at the same time, resulting in more orphan blocks - a situation similar to early mining on a PoW coin with low difficulty.  This should calm down by itself in the next 4-5 days.

The checkpoint warnings, on the other hand, are due to constant attacks on the WATER network because of its low PoW difficulty.  The wallet is actually performing perfectly - it stops creating new transactions when it detects a problem with the blockchain, thus protecting users - and exchanges - from losing coins.  Once the network security is improved by transitioning to purely PoS operation, these checkpoint warnings will also become much less frequent.