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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2):
Nextcloud = 14.0.6
Operating system and version (eg, Ubuntu 17.04):
OS = Debian 9
Apache or nginx version (eg, Apache 2.4.25):
Apache 2
PHP version (eg, 7.1):
PHP 70
The issue you are facing:
Doctrine\DBAL\Exception\DriverException:
Is this the first time you’ve seen this error? (Y/N):
Yes
Steps to replicate it:
every 15 min cron a script:
sudo -u www-data php /var/www/html/nextcloud/cron.php
The output of your Nextcloud log in Admin > Logging:
Doctrine\DBAL\Exception\DriverException: An exception occurred while executing 'DELETE FROM `oc_file_locks` WHERE `ttl` < ?' with params [1547309707]: SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
sudo -u www-data php ./occ config:list system
{
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"192.168.24.100",
"server1",
"REMOVED.dnshome.de"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "14.0.6.0",
"overwrite.cli.url": "https:\/\/192.168.24.100",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"csrf.disabled": false,
"memcached_servers": [
[
"127.0.0.1",
11211
]
],
"memcache.local": "\\OC\\Memcache\\APCu",
"mail_smtpmode": "sendmail",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"theme": "",
"loglevel": 2,
"mail_smtpauthtype": "LOGIN",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"mail_smtpsecure": "tls",
"0": "app.mail.smtp.timeout 30",
"onlyoffice": {
"verify_peer_off": true
},
"updater.secret": "***REMOVED SENSITIVE VALUE***"
}
}
The output of your Apache/nginx/system log in /var/log/____: