"Disruption. Right now we are experiencing high load", it said for some users on the online bank Avanza.
According to Avanza's CEO Gustaf Unger, the activity on the site was record-high.
Last time we had this activity was at the beginning of the corona. The activity we see right now is 50 percent higher, he says to Aftonbladet.
Another peak in user activity is expected when the US stock exchange opens at 15.30, Swedish time.
Handelsbanken also experienced temporary disruptions during the morning, according to the website Downdetector.
The problems come after Europe's stock exchanges plummeted at opening. The stock exchanges in Asia also plummeted on Monday due to the tariffs announced by US President Donald Trump last week.