Iotop high - is this a failing SD card?

I have hassbian on a pi3 running off sd card.

In the last couple of days:

  • top is showing load average is showing consistently
  • top is showing hass using about 14-15% cpu, and 10-11% mem, all pretty normal.
  • iotop shows hass using 99.9%, although sometimes other processes jump to the top like jbd2/mmcblk0p2

Also things are awfully slow, restarting hass takes many minutes, even starting top can take, like, 30s.

Is my SD failing?