192.168.99.1 is BRAS on THGV side, so problem is between your modem and BRAS. Between BRAS and you following possible congestion points:
1)DSL modem (check link speed, might be speed dropping due noise, or might be some upload flood, i hope you modem have necessary counters)
2)Ogero network (prone to have congestion, especially at specific centrales)
3)THGV network (i have plenty of capacity there and monitoring this part)
4)BRAS load (also being monitored, lot of free CPU)
If you can tell me centrale, i will ask support if they have similar complaints, so we can ask Ogero to fix it.
1)DSL modem (check link speed, might be speed dropping due noise, or might be some upload flood, i hope you modem have necessary counters)
2)Ogero network (prone to have congestion, especially at specific centrales)
3)THGV network (i have plenty of capacity there and monitoring this part)
4)BRAS load (also being monitored, lot of free CPU)
If you can tell me centrale, i will ask support if they have similar complaints, so we can ask Ogero to fix it.