My working macro stopped working (no changes were made) - excel

Question

I have a macro that connects to a web-page, gets some info and displays it on a user form (for further actions):
Private Sub UserForm_Initialize()
Dim login As String, password As String
Dim waittime As String
Dim arrForms As Variant
Dim ie As InternetExplorer
LoadingForm.Show vbModeless
LoadingForm.lblLoading.Caption = "Loading..."
waittime = "0:00:02"
login = "lgn"
password = "passwrd"
txtEndDate.Value = Format(Now(), "dd.mm.yyyy")
Set ie = CreateObject("InternetExplorer.Application")
ie.Visible = False
'open login page
ie.navigate "my link (internal company database)"
Do Until Not ie.Busy And ie.readyState = 4
DoEvents
Loop
Application.Wait (Now + TimeValue(waittime))
'if already logged in, skip
On Error GoTo Skip_login
ie.document.getElementById("_58_login").Value = login
ie.document.getElementById("_58_password").Value = password
ie.document.getElementsByClassName("btn btn-primary")(0).Click
Do Until Not ie.Busy And ie.readyState = 4
DoEvents
Loop
Application.Wait (Now + TimeValue(waittime))
Skip_login:
ie.navigate "my link (internal company database)"
Do Until Not ie.Busy And ie.readyState = 4
DoEvents
Loop
Application.Wait (Now + TimeValue(waittime))
arrForms = GetListOfForms(ie) 'this is a function that reads the page,
'finds a table and converts its values to an array
'I tried to comment this line (maybe a bug in my function)
'but even without it the code does not work
For i = LBound(arrForms) To UBound(arrForms)
FormsList.AddItem (arrForms(i))
Next i
'Log out and quit IE
ie.navigate "my link (internal company database)"
Do Until Not ie.Busy And ie.readyState = 4
DoEvents
Loop
Application.Wait (Now + TimeValue(waittime))
ie.document.getElementById("sign-out").Click
Do Until Not ie.Busy And ie.readyState = 4
DoEvents
Loop
Application.Wait (Now + TimeValue(waittime))
ie.Quit
LoadingForm.Hide
End Sub
It worked fine for a few days. It also worked today. But it stopped working for an unknown reason (it just says"automation error" without reference to an error in my code). I was using it, closed the user form, then clicked to start macro again and it does not work. I tried to open older backups - they stopped working too. I did not change anything (links, login/password, any other line of code).
My user form does not have any uncommon user controls. It has the following controls only: text fields, lables, frames, listbox, and buttons)