Erigon v3.3.6 is an important release containing Dandeli hard fork on mainnet Network. The HF is scheduled on block number 81424000 which is estimated to be mined at 9th Jan 2026, 2 PM UTC. It adjusts the gas target calculations to mitigate gas price spikes and to increase effective network throughput.

This release also fixes the intermittent sync issues as well as the issue where the size of the chaindata keeps growing.

As mentioned in this comment, please make sure to do the following:

update the node to this version (v3.3.6-beta)
let it clear backlog
stop node
remove /chaindata/* to reclaim disk size 
restart node 

Please note that this whole process can take some time.