On/off VPN every few minutes

Have just gone to Landline internet (Telstra Velocity) and my AVG VPN started to switch on/off every few minutes. Seemed to cause lots of issues. So, with a while to go with my subscription, I tried to amend this. Message came up saying 'some bits were missing" So have deleted the application but wonder if by not having VPN protection, my computer may be at risk?