Failed to connect to the database: An exception occured in driver: SQLSTATE[28000] [1045] Access denied for user

Hi, I am using Nextcloud 12 on a shared webhost und I updated to 12.01 recently. It worked good for a few days, but suddenly I can’t open my Nextcloud anymore. Errorlog shows an MySQL but I haven’t changed on my database. I am getting the following error:

PHP Fatal error: Uncaught Doctrine\DBAL\DBALException: Failed to connect to the database: An exception occured in driver: SQLSTATE[28000] [1045] Access denied for user ‘user195’@‘localhost’ (using password: YES) in /home/user/domain/lib/private/DB/Connection.php:61
Stack trace:
#0 /home/user/domain/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(429): OC\DB\Connection->connect()
#1 /home/user/domain/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(389): Doctrine\DBAL\Connection->getDatabasePlatformVersion()
#2 /home/user/domain/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(328): Doctrine\DBAL\Connection->detectDatabasePlatform()
#3 /home/user/domain/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(623): Doctrine\DBAL\Connection->getDatabasePlatform()
#4 /home/user/domain/lib/private/DB/Connection.php(148): Doctrine\DBAL\Connection->setTransactionIsolation(2)
#5 /home/user/domain/3rdparty/doc in /home/user/domain/lib/private/DB/Connection.php on line 61