Hi, since a week, syncthing is syncing intermittenly and at very slow speed
The connection with the server is established
<6>syncthing v2.1.2 "Hafnium Hornet" (go1.26.5 linux-amd64) debian@github.syncthing.net 2026-06-26 05:22:40 UTC [noupgrade] (log.pkg=main)
<6>Calculated our device ID (device=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX log.pkg=syncthing)
<6>Overall rate limit in use (send="is unlimited" recv="is unlimited" log.pkg=connections)
<6>Using discovery mechanism (identity="global discovery server https://discovery-lookup.syncthing.net/v2/?noannounce" log.pkg=discover)
<6>Using discovery mechanism (identity="global discovery server https://discovery-announce-v4.syncthing.net/v2/?nolookup" log.pkg=discover)
<6>Using discovery mechanism (identity="global discovery server https://discovery-announce-v6.syncthing.net/v2/?nolookup" log.pkg=discover)
<6>Using discovery mechanism (identity="IPv4 local broadcast discovery on port XXXX" log.pkg=discover)
<6>Using discovery mechanism (identity="IPv6 local multicast discovery on address [XXXXXXXXXXXXX log.pkg=discover)
<6>Ready to synchronize (folder.label=SYNC folder.id=default folder.type=sendreceive log.pkg=model)
<6>TCP listener starting (address=xxx.xxx.xxx.xxx:xxxx log.pkg=connections)
<6>Ready to synchronize (folder.label=SYNC folder.id=xxxxxxx folder.type=sendonly log.pkg=model)
<6>GUI and API listening (address=127.0.0.1:8384 log.pkg=api)
<6>Access the GUI via the following URL: https://127.0.0.1:8384/ (log.pkg=api)
<6>Loaded configuration (name=xxxxx log.pkg=syncthing)
<6>Loaded peer device configuration (device=XXXXXXX name=xxxxx address="[tcp4://xxx.xxx.xxx.xxx:xxxx]" log.pkg=syncthing)
<6>Ready to synchronize (folder.label=SYNC folder.iD=xxxxxxx folder.type=sendonly log.pkg=model)
<6>Completed initial scan (folder.label=SYNC folder.id=default folder.type=sendreceive log.pkg=model)
<6>Measured hashing performance (perf="345.00 MB/s" log.pkg=syncthing)
<6>Completed initial scan (folder.label=SYNC folder.id=xxxxxxx folder.type=sendonly log.pkg=model)
<6>Established secure connection (device=XXXXXXX connection.local=xxx.xxx.xxx.xxx:xxxx connection.remote=xxx.xxx.xxx.xxx:xxxx connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=6659BLO5H398M8FREL4GE2DJRE log.pkg=connections)
<6>New device connection (device=XXXXXXX address=xxx.xxx.xxx.xxx:xxxx remote.name=xxxx remote.client=syncthing remote.version=v2.1.2 log.pkg=model)
<6>Completed initial scan (folder.label=SYNC folder.id=xxxxxxx folder.type=sendonly log.pkg=model)
<6>Established secure connection (device=XXXXXXX connection.local=xxx.xxx.xxx.xxx:xxxx connection.remote=xxx.xxx.xxx.xxx:xxxx connection.type=tcp-server connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=6659BMAA530D4B2RJTN8E49DQ2 log.pkg=connections)
<6>Additional device connection (device=XXXXXXX address=xxx.xxx.xxx.xxx:xxxx count=1 log.pkg=model)
<6>Established secure connection (device=XXXXXXX connection.local=xxx.xxx.xxx.xxx:xxxx connection.remote=xxx.xxx.xxx.xxx:xxxx connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=6659BMCD4232M7E0N07RRKH1OC log.pkg=connections)
<6>Additional device connection (device=XXXXXXX address=xxx.xxx.xxx.xxx:xxxx count=2 log.pkg=model)
<6>Detected NAT services (count=0 log.pkg=nat)
I’m syncing 45 GB but or it does not sync, or it sync at 3/4 MB/s and just for few seconds
The connection is very good via cellular hotspot
I tried to restart syncthing on both sides many times but, nothing changed
Any advice ?