I’ve had this plant for about 1 year and it has been a struggle. Recently a few leaves have had these brown spots appear and then the leaves fall off.

The plant is in a south facing window and it’s now the summer. I’m worried it’s either too hot in the room it’s in or is getting a sunburn. I water it about once/week and I’ve fertilized it a couple times since the spring.

It has only grown 1 new leaf this year.

Many advice would be much appreciated!