Workaround for network issues in OP Netbank
Use Chrome browser.
Open new browser window and clear browsing history from browser Settings > Privacy and security.
We recommend to clear last 24h data, depending when was the last session.
Open new ’incognito’ browser window from Chrome menu by selecting ’New incognito window’ (alternatively Ctrl+Shift+N keyboard shortcut can be used for this)
Start new netbank session in this incognito window.