try clearing the cache on settings that worked for me
This worked for me (old ipad1).
First, turned OFF 'Ask to Join Networks' in Main Settings/wifi
1. Deleted and redownloaded app but didnt open , just left it sitting
2. Main settings/general/reset network
3. Soft reset of ipad using home/power buttons
Without connecting to wifi in Main Settings, this appears to be important......
4. Go straight to Spotify icon, click, a wifi window appears while the main spotify window is open
5. Select and connect to your network within this window
ALL good, after 2 days of pain.