I ran mysql check and got the following results. Could it be wordfence keeping connections open?
.wp_bbpp_thankmelater_opens OK
.wp_bbpp_thankmelater_opt_outs OK
.wp_commentmeta OK
.wp_comments OK
.wp_elp_deliverreport OK
.wp_elp_emaillist OK
.wp_elp_pluginconfig OK
.wp_elp_sendsetting OK
.wp_elp_sentdetails OK
.wp_elp_templatetable OK
.wp_es_deliverreport OK
.wp_es_emaillist OK
.wp_es_notification OK
.wp_es_pluginconfig OK
.wp_es_sentdetails OK
.wp_es_templatetable OK
.wp_icwp_wpsf_audit_trail OK
.wp_icwp_wpsf_ip_lists OK
.wp_icwp_wpsf_user_management OK
.wp_kads_info OK
.wp_links OK
.wp_m_communications OK
.wp_m_coupons OK
.wp_m_levelmeta OK
.wp_m_member_payments OK
.wp_m_membership_levels OK
.wp_m_membership_news OK
.wp_m_membership_relationships OK
.wp_m_membership_rules OK
.wp_m_ping_history OK
.wp_m_pings OK
.wp_m_subscription_transaction OK
.wp_m_subscriptionmeta OK
.wp_m_subscriptions OK
.wp_m_subscriptions_levels OK
.wp_m_urlgroups OK
.wp_newsletter OK
.wp_newsletter_emails OK
.wp_newsletter_sent OK
.wp_newsletter_stats OK
.wp_nxs_log OK
.wp_opanda_leads OK
.wp_opanda_leads_fields OK
.wp_opanda_stats_v2 OK
.wp_options OK
.wp_postmeta OK
.wp_posts OK
.wp_simple_history_contexts OK
.wp_sola_nl_advanced_link_tracking OK
.wp_sola_nl_campaign_lists OK
.wp_sola_nl_campaign_subscribers OK
.wp_sola_nl_campaigns OK
.wp_sola_nl_css_options OK
.wp_sola_nl_link_tracking OK
.wp_sola_nl_list OK
.wp_sola_nl_subscribers OK
.wp_sola_nl_subscribers_list OK
.wp_sola_nl_themes OK
.wp_term_relationships OK
.wp_term_taxonomy OK
.wp_terms OK
.wp_translations OK
.wp_translations_log OK
.wp_usermeta OK
.wp_users OK
.wp_wfBadLeechers OK
.wp_wfBlockedIPLog
warning : 11 clients are using or haven't closed the table properly
status : OK
.wp_wfBlocks
warning : 11 clients are using or haven't closed the table properly
status : OK
.wp_wfBlocksAdv OK
.wp_wfConfig
warning : 14 clients are using or haven't closed the table properly
status : OK
.wp_wfCrawlers
warning : 11 clients are using or haven't closed the table properly
status : OK
.wp_wfFileChanges OK
.wp_wfFileMods OK
.wp_wfHits
warning : 1 client is using or hasn't closed the table properly
status : OK
.wp_wfHoover
warning : 1 client is using or hasn't closed the table properly
status : OK
.wp_wfIssues OK
.wp_wfLeechers
warning : 28 clients are using or haven't closed the table properly
status : OK
.wp_wfLockedOut OK
.wp_wfLocs
warning : 2 clients are using or haven't closed the table properly
status : OK
.wp_wfLogins
warning : 13 clients are using or haven't closed the table properly
status : OK
.wp_wfNet404s
warning : 14 clients are using or haven't closed the table properly
status : OK
.wp_wfReverseCache
warning : 8 clients are using or haven't closed the table properly
status : OK
.wp_wfScanners
warning : 15 clients are using or haven't closed the table properly
status : OK
.wp_wfStatus
warning : 12 clients are using or haven't closed the table properly
status : OK
.wp_wfThrottleLog
warning : 7 clients are using or haven't closed the table properly
status : OK
.wp_wfVulnScanners OK
.wp_wp2crx_registration_table OK
.wp_wpm_forms OK
.wp_wpm_jobs OK
.wp_wpm_subscribers OK
.wp_wpmarketing_ctas OK
.wp_wpmarketing_events OK
.wp_wpmarketing_visitors OK
.wp_wsluserscontacts OK
.wp_wslusersprofiles OK
.wp_wysija_campaign OK
.wp_wysija_campaign_list OK
.wp_wysija_custom_field OK
.wp_wysija_email OK
.wp_wysija_email_user_stat OK
.wp_wysija_email_user_url OK
.wp_wysija_form OK
.wp_wysija_list OK
.wp_wysija_queue OK
.wp_wysija_url OK
.wp_wysija_url_mail OK
.wp_wysija_user OK
.wp_wysija_user_field OK
.wp_wysija_user_history OK
.wp_wysija_user_list OK