Modem restarts randomly, download/upload speed problems

Problem : At random times of the day the modem decides to shut itself down. It comes back in 1-2 minutes, but as I'm working from home, at every connection drop I'm losing my connections, and it's causing me loads of problems during home office. The same problem was happening a year ago. It disappeared, but it came back like a month ago again.

When the connection drops I see new entries in the event log:  FW.LANATTACK DROP, FW.WANATTACK DROP (see attachments). The modem turns off, the lights go red, and it turns back again.

The other problem is that sometimes my upload speed goes below 1-2 megabytes / sec. Also, at the time when I was writing this report my download speed dropped to 0 megabytes / sec.


Solutions I've tried :

- Removing the router from the network, and using only cable to connect to the modem

- Isolating all devices from the network except one at the time

- Turning off the modem, waiting for a couple of minutes before starting it again


Additional data:

- City: Trier, 54290

- I only have internet - "1000 Mbit / s CableMax"

- Free Vodafone modem - CGA4233DE

- I have a router which is connected to the modem, it's TP-Link  Archer C80. The problem is present without using my router in between too, I don't think it's related.


Sorry for the english report. My German is not good enough yet to communicate with people, this is why I didn't call the hotline yet. Thank you for your help in advance!


At the time when I was writing this download speed went to 0At the time when I was writing this download speed went to 0Signal values 1Signal values 1Signal values 2Signal values 2Event log when the problem is happeningEvent log when the problem is happening

12 Antworten 12

Hello Claudia!


Thank you for the answer.

When I experience this issues again I will make a Pinglotter screening.

I will also make a feedback if the connections are working properly again.


Best regards,


Dear Claudia!


Seems like the problems have disappeared. I don't experience packet losses or modem connection losses anymore.

Thank you for the investigation!


Wish you all the bests,



Hi József,


I am glad to read this. I will close here then.




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