Yep, there was a problem for a short time:

WARNING:root:Retry in 1s -- ReadTimeoutError: HTTPSConnectionPool(host='api.steemit.com', port=443): Read timed out. (read timeout=60)
ERROR:steembase.http_client:Unexpected exception! Please report at https://github.com/steemit/steem-python/issues -- RPCError: transaction_expiration_exception from api.steemit.com (transaction expiration exception:) in broadcast_transaction

Just send 0.001 SBD to @tipU with memo: withdraw
(every payment is treated as a deposit, that is used at the time of vote)