Alfresco crashes freuently [3.4.d]

[redone2021]

We have got an alfresco cms server (version 3.4.d) with 32gb ram in production. It frequently crashes. We found following message in catalina.out and alfresco.log. 

18:05:05,620 WARN [org.alfresco.repo.activities.feed.AbstractFeedGenerator] Still busy ...
18:05:43,079 WARN [org.alfresco.repo.activities.feed.AbstractFeedGenerator] Still busy ...
18:06:03,441 WARN [org.alfresco.repo.activities.feed.AbstractFeedGenerator] Still busy ...
18:06:33,349 WARN [org.alfresco.repo.activities.feed.AbstractFeedGenerator] Still busy ...
18:09:35,206 WARN [org.alfresco.repo.activities.feed.AbstractFeedGenerator] Still busy ...

What could cause this frequent crashes? Thanks in advance

[abhinavmishra14]

What do you mean by crashes? You have tagged a very old version, did you use Alfresco version 3.4.d ? The log you shared is not enough to find out what could be causing the issue.. these are just warnings.

Please provide more details such as full catalina.out and alfresco.log and any specifics as to when it happens.