IoT Log Errors - Publish-in error

Hi, I'm noticing some random disconnections on my IoT Things. When looking in the IoT logs on Cloudwatch, I'm getting error logs about "Publish-In" but I can't figure out why they happen. How can I dig into it to understand whats up ? These are the logs (private data deleted) :

Field	Value
@ingestionTime	
1654587159327
@log	
{id_deleted}:AWSIotLogsV2
@message	
{"timestamp":"2022-06-07 07:32:29.807","logLevel":"ERROR","traceId":"{deleted}","accountId":{deleted},"status":"Failure","eventType":"Publish-In","protocol":"MQTT","topicName":"{deleted}","clientId":"{deleted}","principalId":"{deleted}","sourceIp":"{deleted}","sourcePort":{deleted}}
@timestamp	
1654587149807
accountId	
{id_deleted}
clientId	
{id_deleted}
eventType	
Publish-In
logLevel	
ERROR
principalId	
{id_deleted}
protocol	
MQTT
sourceIp	
{deleted}
sourcePort	
{deleted}
status	
Failure
timestamp	
2022-06-07 07:32:29.807
topicName	
{deleted}
traceId	
{deleted}```